diff --git a/app/brave_settings_strings.grdp b/app/brave_settings_strings.grdp
index b87bdd8b7b60..f81927973c6c 100644
--- a/app/brave_settings_strings.grdp
+++ b/app/brave_settings_strings.grdp
@@ -147,12 +147,6 @@
   <message name="IDS_SETTINGS_DE_AMP_SUB_LABEL" desc="The sub-label describing De-AMP feature">
     Always visit original (non-AMP) page URLs, instead of Google's Accelerated Mobile Page versions
   </message>
-  <message name="IDS_SETTINGS_BRAVE_SHIELDS_REDUCE_LANGUAGE_CONTROL_LABEL" desc="Default Brave reduce language control setting label">
-    Prevent sites from fingerprinting me based on my language preferences
-  </message>
-  <message name="IDS_SETTINGS_BRAVE_SHIELDS_REDUCE_LANGUAGE_SUBITEM" desc="Description that shows under main toggle setting for reduce language control setting label">
-    Enabling this setting reduces how much web sites can learn about your language preferences.
-  </message>
   <message name="IDS_SETTINGS_BRAVE_SHIELDS_AD_CONTROL_LABEL" desc="Default Brave block cross-site trackers control setting label">
     Trackers &amp; ads blocking
   </message>
diff --git a/browser/about_flags.cc b/browser/about_flags.cc
index 968adddee7a0..58c5819e0e18 100644
--- a/browser/about_flags.cc
+++ b/browser/about_flags.cc
@@ -53,7 +53,6 @@ using brave_shields::features::kBraveDarkModeBlock;
 using brave_shields::features::kBraveDomainBlock;
 using brave_shields::features::kBraveDomainBlock1PES;
 using brave_shields::features::kBraveExtensionNetworkBlocking;
-using brave_shields::features::kBraveReduceLanguage;
 using brave_shields::features::kCosmeticFilteringSyncLoad;
 
 using de_amp::features::kBraveDeAMP;
@@ -140,10 +139,6 @@ constexpr char kBraveExtensionNetworkBlockingName[] =
 constexpr char kBraveExtensionNetworkBlockingDescription[] =
     "Enable blocking for network requests initiated by extensions";
 
-constexpr char kBraveReduceLanguageName[] = "Reduce language identifiability";
-constexpr char kBraveReduceLanguageDescription[] =
-    "Reduce the identifiability of my language preferences";
-
 constexpr char kCosmeticFilteringSyncLoadName[] =
     "Enable sync loading of cosmetic filter rules";
 constexpr char kCosmeticFilteringSyncLoadDescription[] =
@@ -517,10 +512,6 @@ const flags_ui::FeatureEntry::Choice kBraveSkusEnvChoices[] = {
      flag_descriptions::kBraveExtensionNetworkBlockingName,                 \
      flag_descriptions::kBraveExtensionNetworkBlockingDescription, kOsAll,  \
      FEATURE_VALUE_TYPE(kBraveExtensionNetworkBlocking)},                   \
-    {"brave-reduce-language",                                               \
-        flag_descriptions::kBraveReduceLanguageName,                        \
-        flag_descriptions::kBraveReduceLanguageDescription, kOsAll,         \
-        FEATURE_VALUE_TYPE(kBraveReduceLanguage)},                          \
     {"brave-cosmetic-filtering-sync-load",                                  \
      flag_descriptions::kCosmeticFilteringSyncLoadName,                     \
      flag_descriptions::kCosmeticFilteringSyncLoadDescription, kOsAll,      \
diff --git a/browser/brave_browser_process.h b/browser/brave_browser_process.h
index ddd1ad55713f..206c83be3a40 100644
--- a/browser/brave_browser_process.h
+++ b/browser/brave_browser_process.h
@@ -21,7 +21,6 @@
 namespace brave {
 class BraveReferralsService;
 class BraveP3AService;
-class BraveFarblingService;
 }  // namespace brave
 
 namespace brave_component_updater {
@@ -105,7 +104,6 @@ class BraveBrowserProcess {
   speedreader_rewriter_service() = 0;
 #endif
   virtual brave_ads::ResourceComponent* resource_component() = 0;
-  virtual brave::BraveFarblingService* brave_farbling_service() = 0;
 };
 
 extern BraveBrowserProcess* g_brave_browser_process;
diff --git a/browser/brave_browser_process_impl.cc b/browser/brave_browser_process_impl.cc
index 6309922852d6..6175ce648684 100644
--- a/browser/brave_browser_process_impl.cc
+++ b/browser/brave_browser_process_impl.cc
@@ -5,7 +5,6 @@
 
 #include "brave/browser/brave_browser_process_impl.h"
 
-#include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ -26,7 +25,6 @@
 #include "brave/components/brave_shields/browser/ad_block_regional_service_manager.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
 #include "brave/components/brave_shields/browser/ad_block_subscription_service_manager.h"
-#include "brave/components/brave_shields/browser/brave_farbling_service.h"
 #include "brave/components/brave_shields/browser/https_everywhere_service.h"
 #include "brave/components/brave_sync/network_time_helper.h"
 #include "brave/components/constants/pref_names.h"
@@ -48,7 +46,6 @@
 #include "content/public/browser/child_process_security_policy.h"
 #include "services/network/public/cpp/resource_request.h"
 #include "services/network/public/cpp/shared_url_loader_factory.h"
-#include "url/gurl.h"
 
 #if BUILDFLAG(ENABLE_BRAVE_REFERRALS)
 #include "brave/components/brave_referrals/browser/brave_referrals_service.h"
@@ -383,9 +380,3 @@ ipfs::BraveIpfsClientUpdater* BraveBrowserProcessImpl::ipfs_client_updater() {
   return ipfs_client_updater_.get();
 }
 #endif  // BUILDFLAG(ENABLE_IPFS)
-
-brave::BraveFarblingService* BraveBrowserProcessImpl::brave_farbling_service() {
-  if (!brave_farbling_service_)
-    brave_farbling_service_ = std::make_unique<brave::BraveFarblingService>();
-  return brave_farbling_service_.get();
-}
diff --git a/browser/brave_browser_process_impl.h b/browser/brave_browser_process_impl.h
index b35d968234a2..65fdeacaaec9 100644
--- a/browser/brave_browser_process_impl.h
+++ b/browser/brave_browser_process_impl.h
@@ -23,7 +23,6 @@ namespace brave {
 class BraveReferralsService;
 class BraveP3AService;
 class HistogramsBraveizer;
-class BraveFarblingService;
 }  // namespace brave
 
 namespace brave_component_updater {
@@ -116,7 +115,6 @@ class BraveBrowserProcessImpl : public BraveBrowserProcess,
   speedreader::SpeedreaderRewriterService* speedreader_rewriter_service()
       override;
 #endif
-  brave::BraveFarblingService* brave_farbling_service() override;
 
  private:
   // BrowserProcessImpl overrides:
@@ -175,8 +173,6 @@ class BraveBrowserProcessImpl : public BraveBrowserProcess,
       speedreader_rewriter_service_;
 #endif
 
-  std::unique_ptr<brave::BraveFarblingService> brave_farbling_service_;
-
   SEQUENCE_CHECKER(sequence_checker_);
 };
 
diff --git a/browser/brave_content_browser_client.cc b/browser/brave_content_browser_client.cc
index 3e976dcea62d..b2d43105f065 100644
--- a/browser/brave_content_browser_client.cc
+++ b/browser/brave_content_browser_client.cc
@@ -12,12 +12,12 @@
 
 #include "base/bind.h"
 #include "base/json/json_reader.h"
+#include "base/rand_util.h"
 #include "base/strings/strcat.h"
 #include "base/system/sys_info.h"
 #include "brave/browser/brave_browser_main_extra_parts.h"
 #include "brave/browser/brave_browser_process.h"
 #include "brave/browser/brave_shields/brave_shields_web_contents_observer.h"
-#include "brave/browser/brave_shields/reduce_language_navigation_throttle.h"
 #include "brave/browser/brave_wallet/brave_wallet_context_utils.h"
 #include "brave/browser/brave_wallet/brave_wallet_provider_delegate_impl.h"
 #include "brave/browser/brave_wallet/brave_wallet_service_factory.h"
@@ -44,7 +44,6 @@
 #include "brave/components/brave_search/common/brave_search_fallback.mojom.h"
 #include "brave/components/brave_search/common/brave_search_utils.h"
 #include "brave/components/brave_shields/browser/ad_block_service.h"
-#include "brave/components/brave_shields/browser/brave_farbling_service.h"
 #include "brave/components/brave_shields/browser/brave_shields_util.h"
 #include "brave/components/brave_shields/browser/domain_block_navigation_throttle.h"
 #include "brave/components/brave_shields/common/brave_shield_constants.h"
@@ -378,7 +377,9 @@ void MaybeBindSkusSdkImpl(
 
 }  // namespace
 
-BraveContentBrowserClient::BraveContentBrowserClient() {}
+BraveContentBrowserClient::BraveContentBrowserClient()
+    : session_token_(base::RandUint64()),
+      incognito_session_token_(base::RandUint64()) {}
 
 BraveContentBrowserClient::~BraveContentBrowserClient() {}
 
@@ -653,9 +654,11 @@ void BraveContentBrowserClient::AppendExtraCommandLineSwitches(
       Profile* profile =
           process ? Profile::FromBrowserContext(process->GetBrowserContext())
                   : nullptr;
-      session_token =
-          g_brave_browser_process->brave_farbling_service()->session_token(
-              profile && !profile->IsOffTheRecord());
+      if (profile && !profile->IsOffTheRecord()) {
+        session_token = session_token_;
+      } else {
+        session_token = incognito_session_token_;
+      }
     }
     command_line->AppendSwitchASCII("brave_session_token",
                                     base::NumberToString(session_token));
@@ -956,13 +959,6 @@ BraveContentBrowserClient::CreateThrottlesForNavigation(
               g_browser_process->GetApplicationLocale()))
     throttles.push_back(std::move(domain_block_navigation_throttle));
 
-  if (std::unique_ptr<content::NavigationThrottle>
-          reduce_language_navigation_throttle = brave_shields::
-              ReduceLanguageNavigationThrottle::MaybeCreateThrottleFor(
-                  handle, HostContentSettingsMapFactory::GetForProfile(
-                              Profile::FromBrowserContext(context))))
-    throttles.push_back(std::move(reduce_language_navigation_throttle));
-
   return throttles;
 }
 
diff --git a/browser/brave_content_browser_client.h b/browser/brave_content_browser_client.h
index 95ef08c282c7..79bff06f2285 100644
--- a/browser/brave_content_browser_client.h
+++ b/browser/brave_content_browser_client.h
@@ -147,6 +147,9 @@ class BraveContentBrowserClient : public ChromeContentBrowserClient {
   blink::UserAgentMetadata GetUserAgentMetadata() override;
 
  private:
+  uint64_t session_token_;
+  uint64_t incognito_session_token_;
+
   void OnAllowGoogleAuthChanged();
 
   std::unique_ptr<PrefChangeRegistrar, content::BrowserThread::DeleteOnUIThread>
diff --git a/browser/brave_prefs_browsertest.cc b/browser/brave_prefs_browsertest.cc
index 473ee5bac6fc..d2b06f6651ec 100644
--- a/browser/brave_prefs_browsertest.cc
+++ b/browser/brave_prefs_browsertest.cc
@@ -81,8 +81,6 @@ IN_PROC_BROWSER_TEST_F(BraveProfilePrefsBrowserTest, MiscBravePrefs) {
       brave_shields::prefs::kTwitterEmbedControlType));
   EXPECT_FALSE(chrome_test_utils::GetProfile(this)->GetPrefs()->GetBoolean(
       brave_shields::prefs::kLinkedInEmbedControlType));
-  EXPECT_TRUE(chrome_test_utils::GetProfile(this)->GetPrefs()->GetBoolean(
-      brave_shields::prefs::kReduceLanguageEnabled));
 #if BUILDFLAG(ENABLE_BRAVE_WAYBACK_MACHINE)
   EXPECT_TRUE(chrome_test_utils::GetProfile(this)->GetPrefs()->GetBoolean(
       kWebTorrentEnabled));
diff --git a/browser/brave_profile_prefs.cc b/browser/brave_profile_prefs.cc
index c7ce9e204942..e17e0e80e36f 100644
--- a/browser/brave_profile_prefs.cc
+++ b/browser/brave_profile_prefs.cc
@@ -23,7 +23,6 @@
 #include "brave/components/brave_search/browser/brave_search_default_host.h"
 #include "brave/components/brave_search/common/brave_search_utils.h"
 #include "brave/components/brave_search_conversion/utils.h"
-#include "brave/components/brave_shields/browser/brave_farbling_service.h"
 #include "brave/components/brave_shields/browser/brave_shields_p3a.h"
 #include "brave/components/brave_shields/common/pref_names.h"
 #include "brave/components/brave_sync/brave_sync_prefs.h"
@@ -456,8 +455,6 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
       policy::policy_prefs::kIsolatedAppsDeveloperModeAllowed,
       base::Value(false));
 
-  BraveFarblingService::RegisterProfilePrefs(registry);
-
   RegisterProfilePrefsForMigration(registry);
 
 #if BUILDFLAG(ENABLE_BRAVE_TRANSLATE_GO)
diff --git a/browser/brave_shields/brave_shields_web_contents_observer.cc b/browser/brave_shields/brave_shields_web_contents_observer.cc
index f2884ee0bd8b..ba7fb1dbe103 100644
--- a/browser/brave_shields/brave_shields_web_contents_observer.cc
+++ b/browser/brave_shields/brave_shields_web_contents_observer.cc
@@ -15,13 +15,11 @@
 #include "brave/components/brave_shields/browser/brave_shields_util.h"
 #include "brave/components/brave_shields/common/brave_shield_constants.h"
 #include "brave/components/brave_shields/common/features.h"
-#include "brave/components/brave_shields/common/pref_names.h"
 #include "brave/components/constants/pref_names.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/renderer_configuration.mojom.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
-#include "components/user_prefs/user_prefs.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
@@ -72,14 +70,6 @@ void BraveShieldsWebContentsObserver::RenderFrameCreated(RenderFrameHost* rfh) {
     GetBraveShieldsRemote(rfh)->SetAllowScriptsFromOriginsOnce(
         allowed_script_origins_);
   }
-  if (rfh) {
-    if (content::BrowserContext* context = rfh->GetBrowserContext()) {
-      if (PrefService* pref_service = user_prefs::UserPrefs::Get(context)) {
-        GetBraveShieldsRemote(rfh)->SetReduceLanguageEnabled(
-            brave_shields::IsReduceLanguageEnabledForProfile(pref_service));
-      }
-    }
-  }
 }
 
 void BraveShieldsWebContentsObserver::RenderFrameDeleted(RenderFrameHost* rfh) {
@@ -252,14 +242,6 @@ void BraveShieldsWebContentsObserver::ReadyToCommitNavigation(
             observer->GetBraveShieldsRemote(rfh)
                 ->SetAllowScriptsFromOriginsOnce(
                     observer->allowed_script_origins_);
-            if (content::BrowserContext* context = rfh->GetBrowserContext()) {
-              if (PrefService* pref_service =
-                      user_prefs::UserPrefs::Get(context)) {
-                observer->GetBraveShieldsRemote(rfh)->SetReduceLanguageEnabled(
-                    brave_shields::IsReduceLanguageEnabledForProfile(
-                        pref_service));
-              }
-            }
           },
           base::Unretained(this)));
 }
diff --git a/browser/brave_shields/reduce_language_navigation_throttle.cc b/browser/brave_shields/reduce_language_navigation_throttle.cc
deleted file mode 100644
index bbed21544b4e..000000000000
--- a/browser/brave_shields/reduce_language_navigation_throttle.cc
+++ /dev/null
@@ -1,116 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/browser/brave_shields/reduce_language_navigation_throttle.h"
-
-#include <memory>
-#include <utility>
-
-#include "base/feature_list.h"
-#include "base/threading/thread_task_runner_handle.h"
-#include "brave/browser/brave_browser_process.h"
-#include "brave/components/brave_shields/browser/brave_farbling_service.h"
-#include "brave/components/brave_shields/browser/brave_shields_util.h"
-#include "brave/components/brave_shields/common/features.h"
-#include "chrome/browser/profiles/profile.h"
-#include "components/content_settings/core/browser/host_content_settings_map.h"
-#include "components/language/core/browser/language_prefs.h"
-#include "components/language/core/browser/pref_names.h"
-#include "components/prefs/pref_service.h"
-#include "components/user_prefs/user_prefs.h"
-#include "content/public/browser/browser_context.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/navigation_handle.h"
-#include "content/public/browser/web_contents.h"
-#include "net/http/http_request_headers.h"
-#include "net/http/http_util.h"
-
-namespace brave_shields {
-
-// static
-std::unique_ptr<ReduceLanguageNavigationThrottle>
-ReduceLanguageNavigationThrottle::MaybeCreateThrottleFor(
-    content::NavigationHandle* navigation_handle,
-    HostContentSettingsMap* content_settings) {
-  content::BrowserContext* context =
-      navigation_handle->GetWebContents()->GetBrowserContext();
-  PrefService* pref_service = user_prefs::UserPrefs::Get(context);
-  if (!IsReduceLanguageEnabledForProfile(pref_service))
-    return nullptr;
-  return std::make_unique<ReduceLanguageNavigationThrottle>(navigation_handle,
-                                                            content_settings);
-}
-
-ReduceLanguageNavigationThrottle::ReduceLanguageNavigationThrottle(
-    content::NavigationHandle* navigation_handle,
-    HostContentSettingsMap* content_settings)
-    : content::NavigationThrottle(navigation_handle),
-      content_settings_(content_settings) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-}
-
-ReduceLanguageNavigationThrottle::~ReduceLanguageNavigationThrottle() {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-}
-
-content::NavigationThrottle::ThrottleCheckResult
-ReduceLanguageNavigationThrottle::WillStartRequest() {
-  UpdateHeaders();
-  return content::NavigationThrottle::PROCEED;
-}
-
-content::NavigationThrottle::ThrottleCheckResult
-ReduceLanguageNavigationThrottle::WillRedirectRequest() {
-  UpdateHeaders();
-  return content::NavigationThrottle::PROCEED;
-}
-
-void ReduceLanguageNavigationThrottle::UpdateHeaders() {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  content::NavigationHandle* handle = navigation_handle();
-  GURL url = handle->GetURL();
-  content::BrowserContext* context =
-      handle->GetWebContents()->GetBrowserContext();
-  PrefService* pref_service = user_prefs::UserPrefs::Get(context);
-
-  if (!brave_shields::ShouldDoReduceLanguage(content_settings_, url,
-                                             pref_service))
-    return;
-
-  ControlType fingerprinting_control_type =
-      brave_shields::GetFingerprintingControlType(content_settings_, url);
-
-  // If fingerprint blocking is maximum, set Accept-Language header to
-  // static value regardless of other preferences.
-  if (fingerprinting_control_type == ControlType::BLOCK) {
-    handle->SetRequestHeader(net::HttpRequestHeaders::kAcceptLanguage,
-                             "en-US,en");
-    return;
-  }
-
-  // If fingerprint blocking is default, compute Accept-Language header
-  // based on user preferences.
-  std::string languages =
-      pref_service->Get(language::prefs::kAcceptLanguages)->GetString();
-  std::string first_language = language::GetFirstLanguage(languages);
-  // Add a fake q value after the language code.
-  std::vector<std::string> q_values = {";q=0.5", ";q=0.6", ";q=0.7", ";q=0.8",
-                                       ";q=0.9"};
-  brave::FarblingPRNG prng;
-  auto* profile = Profile::FromBrowserContext(context);
-  if (g_brave_browser_process->brave_farbling_service()
-          ->MakePseudoRandomGeneratorForURL(
-              url, profile && !profile->IsOffTheRecord(), &prng)) {
-    first_language += q_values[prng() % q_values.size()];
-  }
-  handle->SetRequestHeader(net::HttpRequestHeaders::kAcceptLanguage,
-                           first_language);
-}
-
-const char* ReduceLanguageNavigationThrottle::GetNameForLogging() {
-  return "ReduceLanguageNavigationThrottle";
-}
-
-}  // namespace brave_shields
diff --git a/browser/brave_shields/reduce_language_navigation_throttle.h b/browser/brave_shields/reduce_language_navigation_throttle.h
deleted file mode 100644
index 29ad25737271..000000000000
--- a/browser/brave_shields/reduce_language_navigation_throttle.h
+++ /dev/null
@@ -1,60 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef BRAVE_BROWSER_BRAVE_SHIELDS_REDUCE_LANGUAGE_NAVIGATION_THROTTLE_H_
-#define BRAVE_BROWSER_BRAVE_SHIELDS_REDUCE_LANGUAGE_NAVIGATION_THROTTLE_H_
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/memory/weak_ptr.h"
-#include "brave/components/brave_shields/browser/brave_shields_util.h"
-#include "content/public/browser/navigation_throttle.h"
-#include "url/gurl.h"
-
-class HostContentSettingsMap;
-
-namespace content {
-class NavigationHandle;
-class WebContents;
-}  // namespace content
-
-namespace brave_shields {
-
-class ReduceLanguageNavigationThrottle : public content::NavigationThrottle {
- public:
-  explicit ReduceLanguageNavigationThrottle(
-      content::NavigationHandle* navigation_handle,
-      HostContentSettingsMap* content_settings);
-  ~ReduceLanguageNavigationThrottle() override;
-
-  ReduceLanguageNavigationThrottle(const ReduceLanguageNavigationThrottle&) =
-      delete;
-  ReduceLanguageNavigationThrottle& operator=(
-      const ReduceLanguageNavigationThrottle&) = delete;
-
-  static std::unique_ptr<ReduceLanguageNavigationThrottle>
-  MaybeCreateThrottleFor(content::NavigationHandle* navigation_handle,
-                         HostContentSettingsMap* content_settings);
-
-  // content::NavigationThrottle implementation:
-  content::NavigationThrottle::ThrottleCheckResult WillStartRequest() override;
-  content::NavigationThrottle::ThrottleCheckResult WillRedirectRequest()
-      override;
-  const char* GetNameForLogging() override;
-
- private:
-  HostContentSettingsMap* content_settings_ = nullptr;
-
-  void UpdateHeaders();
-
-  base::WeakPtrFactory<ReduceLanguageNavigationThrottle> weak_ptr_factory_{
-      this};
-};
-
-}  // namespace brave_shields
-
-#endif  // BRAVE_BROWSER_BRAVE_SHIELDS_REDUCE_LANGUAGE_NAVIGATION_THROTTLE_H_
diff --git a/browser/brave_shields/sources.gni b/browser/brave_shields/sources.gni
index ddb31f94395b..82b2e4286528 100644
--- a/browser/brave_shields/sources.gni
+++ b/browser/brave_shields/sources.gni
@@ -14,8 +14,6 @@ brave_browser_brave_shields_sources = [
   "//brave/browser/brave_shields/brave_shields_web_contents_observer.h",
   "//brave/browser/brave_shields/https_everywhere_component_installer.cc",
   "//brave/browser/brave_shields/https_everywhere_component_installer.h",
-  "//brave/browser/brave_shields/reduce_language_navigation_throttle.cc",
-  "//brave/browser/brave_shields/reduce_language_navigation_throttle.h",
 ]
 
 brave_browser_brave_shields_deps = [
diff --git a/browser/extensions/api/settings_private/brave_prefs_util.cc b/browser/extensions/api/settings_private/brave_prefs_util.cc
index 1eba63ac44d6..1866f5d8fd8a 100644
--- a/browser/extensions/api/settings_private/brave_prefs_util.cc
+++ b/browser/extensions/api/settings_private/brave_prefs_util.cc
@@ -111,8 +111,6 @@ const PrefsUtil::TypedPrefMap& BravePrefsUtil::GetAllowlistedKeys() {
       settings_api::PrefType::PREF_TYPE_BOOLEAN;
   (*s_brave_allowlist)[brave_shields::prefs::kLinkedInEmbedControlType] =
       settings_api::PrefType::PREF_TYPE_BOOLEAN;
-  (*s_brave_allowlist)[brave_shields::prefs::kReduceLanguageEnabled] =
-      settings_api::PrefType::PREF_TYPE_BOOLEAN;
 
   // Rewards/Ads prefs
   (*s_brave_allowlist)[ads::prefs::kEnabled] =
diff --git a/browser/farbling/BUILD.gn b/browser/farbling/BUILD.gn
index 4a4ddc46cd79..e2289c7ac7d9 100644
--- a/browser/farbling/BUILD.gn
+++ b/browser/farbling/BUILD.gn
@@ -15,7 +15,6 @@ if (!is_android) {
       "brave_navigator_devicememory_farbling_browsertest.cc",
       "brave_navigator_hardwareconcurrency_farbling_browsertest.cc",
       "brave_navigator_keyboard_api_browsertest.cc",
-      "brave_navigator_languages_farbling_browsertest.cc",
       "brave_navigator_plugins_farbling_browsertest.cc",
       "brave_navigator_useragent_farbling_browsertest.cc",
       "brave_offscreencanvas_farbling_browsertest.cc",
diff --git a/browser/farbling/brave_navigator_languages_farbling_browsertest.cc b/browser/farbling/brave_navigator_languages_farbling_browsertest.cc
deleted file mode 100644
index 07a0277cfbaa..000000000000
--- a/browser/farbling/brave_navigator_languages_farbling_browsertest.cc
+++ /dev/null
@@ -1,266 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "base/path_service.h"
-#include "base/strings/stringprintf.h"
-#include "base/test/thread_test_helper.h"
-#include "brave/browser/brave_browser_process.h"
-#include "brave/browser/brave_content_browser_client.h"
-#include "brave/browser/extensions/brave_base_local_data_files_browsertest.h"
-#include "brave/components/brave_component_updater/browser/local_data_files_service.h"
-#include "brave/components/brave_shields/browser/brave_farbling_service.h"
-#include "brave/components/brave_shields/browser/brave_shields_util.h"
-#include "brave/components/brave_shields/common/features.h"
-#include "brave/components/constants/brave_paths.h"
-#include "brave/components/constants/pref_names.h"
-#include "chrome/browser/content_settings/host_content_settings_map_factory.h"
-#include "chrome/browser/extensions/extension_browsertest.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/common/chrome_content_client.h"
-#include "chrome/test/base/in_process_browser_test.h"
-#include "chrome/test/base/ui_test_utils.h"
-#include "components/language/core/browser/pref_names.h"
-#include "components/network_session_configurator/common/network_switches.h"
-#include "components/permissions/permission_request.h"
-#include "components/prefs/pref_service.h"
-#include "components/user_prefs/user_prefs.h"
-#include "content/public/browser/render_frame_host.h"
-#include "content/public/renderer/render_frame.h"
-#include "content/public/test/browser_test.h"
-#include "content/public/test/browser_test_utils.h"
-#include "net/dns/mock_host_resolver.h"
-#include "third_party/blink/public/web/web_local_frame.h"
-#include "third_party/blink/renderer/core/frame/local_dom_window.h"
-#include "third_party/blink/renderer/core/frame/navigator.h"
-#include "third_party/blink/renderer/core/frame/navigator_language.h"
-
-using brave_shields::ControlType;
-using content::TitleWatcher;
-
-namespace {
-const char kNavigatorLanguagesScript[] = "navigator.languages.toString()";
-const uint64_t kTestingSessionToken = 12345;
-}  // namespace
-
-class BraveNavigatorLanguagesFarblingBrowserTest : public InProcessBrowserTest {
- public:
-  BraveNavigatorLanguagesFarblingBrowserTest()
-      : https_server_(net::EmbeddedTestServer::TYPE_HTTPS) {
-    brave::RegisterPathProvider();
-    base::FilePath test_data_dir;
-    base::PathService::Get(brave::DIR_TEST_DATA, &test_data_dir);
-    https_server_.SetSSLConfig(net::EmbeddedTestServer::CERT_TEST_NAMES);
-    https_server_.ServeFilesFromDirectory(test_data_dir);
-    https_server_.RegisterRequestMonitor(base::BindRepeating(
-        &BraveNavigatorLanguagesFarblingBrowserTest::MonitorHTTPRequest,
-        base::Unretained(this)));
-    EXPECT_TRUE(https_server_.Start());
-  }
-
-  BraveNavigatorLanguagesFarblingBrowserTest(
-      const BraveNavigatorLanguagesFarblingBrowserTest&) = delete;
-  BraveNavigatorLanguagesFarblingBrowserTest& operator=(
-      const BraveNavigatorLanguagesFarblingBrowserTest&) = delete;
-
-  ~BraveNavigatorLanguagesFarblingBrowserTest() override {}
-
-  void SetUpOnMainThread() override {
-    InProcessBrowserTest::SetUpOnMainThread();
-
-    content_client_.reset(new ChromeContentClient);
-    content::SetContentClient(content_client_.get());
-    browser_content_client_.reset(new BraveContentBrowserClient());
-    content::SetBrowserClientForTesting(browser_content_client_.get());
-    g_brave_browser_process->brave_farbling_service()
-        ->set_session_tokens_for_testing(kTestingSessionToken,
-                                         kTestingSessionToken);
-
-    host_resolver()->AddRule("*", "127.0.0.1");
-  }
-
-  void TearDown() override {
-    browser_content_client_.reset();
-    content_client_.reset();
-  }
-
- protected:
-  base::test::ScopedFeatureList feature_list_;
-  net::EmbeddedTestServer https_server_;
-
-  HostContentSettingsMap* content_settings() {
-    return HostContentSettingsMapFactory::GetForProfile(browser()->profile());
-  }
-
-  void AllowFingerprinting(std::string domain) {
-    brave_shields::SetFingerprintingControlType(
-        content_settings(), ControlType::ALLOW,
-        https_server_.GetURL(domain, "/"));
-  }
-
-  void BlockFingerprinting(std::string domain) {
-    brave_shields::SetFingerprintingControlType(
-        content_settings(), ControlType::BLOCK,
-        https_server_.GetURL(domain, "/"));
-  }
-
-  void SetFingerprintingDefault(std::string domain) {
-    brave_shields::SetFingerprintingControlType(
-        content_settings(), ControlType::DEFAULT,
-        https_server_.GetURL(domain, "/"));
-  }
-
-  content::WebContents* web_contents() {
-    return browser()->tab_strip_model()->GetActiveWebContents();
-  }
-
-  bool NavigateToURLUntilLoadStop(const GURL& url) {
-    EXPECT_TRUE(ui_test_utils::NavigateToURL(browser(), url));
-    return WaitForLoadStop(web_contents());
-  }
-
-  void SetAcceptLanguages(const std::string& accept_languages) {
-    content::BrowserContext* context =
-        static_cast<content::BrowserContext*>(browser()->profile());
-    PrefService* prefs = user_prefs::UserPrefs::Get(context);
-    prefs->Set(language::prefs::kSelectedLanguages,
-               base::Value(accept_languages));
-  }
-
-  void MonitorHTTPRequest(const net::test_server::HttpRequest& request) {
-    if (request.relative_url != "/simple.html")
-      return;
-    if (expected_http_accept_language_.empty())
-      return;
-    EXPECT_EQ(request.headers.at("accept-language"),
-              expected_http_accept_language_);
-  }
-
-  void SetExpectedHTTPAcceptLanguage(
-      const std::string& expected_http_accept_language) {
-    expected_http_accept_language_ = expected_http_accept_language;
-  }
-
- private:
-  std::unique_ptr<ChromeContentClient> content_client_;
-  std::unique_ptr<BraveContentBrowserClient> browser_content_client_;
-  std::string expected_http_accept_language_;
-};
-
-// Tests results of farbling known values
-IN_PROC_BROWSER_TEST_F(BraveNavigatorLanguagesFarblingBrowserTest,
-                       FarbleLanguages) {
-  std::string domain1 = "b.test";
-  std::string domain2 = "d.test";
-  GURL url1 = https_server_.GetURL(domain1, "/simple.html");
-  GURL url2 = https_server_.GetURL(domain2, "/simple.html");
-  // Farbling level: off
-  AllowFingerprinting(domain1);
-  NavigateToURLUntilLoadStop(url1);
-  std::string testing_languages = "en-US,en,es,la";
-  SetAcceptLanguages(testing_languages);
-  EXPECT_EQ(testing_languages,
-            EvalJs(web_contents(), kNavigatorLanguagesScript));
-  AllowFingerprinting(domain2);
-  NavigateToURLUntilLoadStop(url2);
-  EXPECT_EQ(testing_languages,
-            EvalJs(web_contents(), kNavigatorLanguagesScript));
-
-  // Farbling level: default
-  SetFingerprintingDefault(domain1);
-  NavigateToURLUntilLoadStop(url1);
-  std::string standard_languages = "en-US";
-  EXPECT_EQ(standard_languages,
-            EvalJs(web_contents(), kNavigatorLanguagesScript));
-  SetFingerprintingDefault(domain2);
-  NavigateToURLUntilLoadStop(url2);
-  EXPECT_EQ(standard_languages,
-            EvalJs(web_contents(), kNavigatorLanguagesScript));
-
-  // Farbling level: maximum
-  BlockFingerprinting(domain1);
-  NavigateToURLUntilLoadStop(url1);
-  std::string strict_languages = "en-US,en";
-  EXPECT_EQ(strict_languages,
-            EvalJs(web_contents(), kNavigatorLanguagesScript));
-  BlockFingerprinting(domain2);
-  NavigateToURLUntilLoadStop(url2);
-  EXPECT_EQ(strict_languages,
-            EvalJs(web_contents(), kNavigatorLanguagesScript));
-}
-
-// Tests that web workers inherit the farbled navigator.languages
-IN_PROC_BROWSER_TEST_F(BraveNavigatorLanguagesFarblingBrowserTest,
-                       FarbleLanguagesWebWorker) {
-  std::u16string expected_title(u"pass");
-  std::string domain = "b.test";
-  GURL url = https_server_.GetURL(domain, "/navigator/workers-languages.html");
-
-  // Farbling level: off
-  AllowFingerprinting(domain);
-  NavigateToURLUntilLoadStop(url);
-  TitleWatcher watcher1(web_contents(), expected_title);
-  EXPECT_EQ(expected_title, watcher1.WaitAndGetTitle());
-
-  // Farbling level: default
-  SetFingerprintingDefault(domain);
-  NavigateToURLUntilLoadStop(url);
-  TitleWatcher watcher2(web_contents(), expected_title);
-  EXPECT_EQ(expected_title, watcher2.WaitAndGetTitle());
-
-  // Farbling level: maximum
-  BlockFingerprinting(domain);
-  NavigateToURLUntilLoadStop(url);
-  TitleWatcher watcher3(web_contents(), expected_title);
-  EXPECT_EQ(expected_title, watcher3.WaitAndGetTitle());
-}
-
-// Tests that service workers inherit the farbled navigator.languages
-IN_PROC_BROWSER_TEST_F(BraveNavigatorLanguagesFarblingBrowserTest,
-                       FarbleLanguagesServiceWorker) {
-  std::u16string expected_title(u"pass");
-  std::string domain = "b.test";
-  GURL url =
-      https_server_.GetURL(domain, "/navigator/service-workers-languages.html");
-  // Farbling level: default
-  SetFingerprintingDefault(domain);
-  NavigateToURLUntilLoadStop(url);
-  TitleWatcher watcher2(web_contents(), expected_title);
-  EXPECT_EQ(expected_title, watcher2.WaitAndGetTitle());
-}
-
-// Tests results of farbling user agent
-IN_PROC_BROWSER_TEST_F(BraveNavigatorLanguagesFarblingBrowserTest,
-                       FarbleHTTPAcceptLanguage) {
-  std::string domain_b = "b.test";
-  std::string domain_d = "d.test";
-  GURL url_b = https_server_.GetURL(domain_b, "/simple.html");
-  GURL url_d = https_server_.GetURL(domain_d, "/simple.html");
-  SetAcceptLanguages("la,es,en");
-
-  // Farbling level: off
-  // HTTP Accept-Language header should not be farbled.
-  AllowFingerprinting(domain_b);
-  SetExpectedHTTPAcceptLanguage("la,es;q=0.9,en;q=0.8");
-  NavigateToURLUntilLoadStop(url_b);
-  AllowFingerprinting(domain_d);
-  NavigateToURLUntilLoadStop(url_d);
-
-  // Farbling level: default
-  // HTTP Accept-Language header should be farbled by domain.
-  SetFingerprintingDefault(domain_b);
-  SetExpectedHTTPAcceptLanguage("la;q=0.7");
-  NavigateToURLUntilLoadStop(url_b);
-  SetExpectedHTTPAcceptLanguage("la;q=0.8");
-  SetFingerprintingDefault(domain_d);
-  NavigateToURLUntilLoadStop(url_d);
-
-  // Farbling level: maximum
-  // HTTP Accept-Language header should be farbled but the same across domains.
-  BlockFingerprinting(domain_b);
-  SetExpectedHTTPAcceptLanguage("en-US,en");
-  NavigateToURLUntilLoadStop(url_b);
-  BlockFingerprinting(domain_d);
-  NavigateToURLUntilLoadStop(url_d);
-}
diff --git a/browser/resources/settings/default_brave_shields_page/default_brave_shields_page.html b/browser/resources/settings/default_brave_shields_page/default_brave_shields_page.html
index 6d3de027e8bc..6c0a26e41211 100644
--- a/browser/resources/settings/default_brave_shields_page/default_brave_shields_page.html
+++ b/browser/resources/settings/default_brave_shields_page/default_brave_shields_page.html
@@ -50,12 +50,6 @@
     label="$i18n{deAmpSettingLabel}"
     sub-label="$i18n{deAmpSettingSubLabel}">
   </settings-toggle-button>
-  <settings-toggle-button
-      class="cr-row"
-      pref="{{prefs.brave.reduce_language}}"
-      label="$i18n{reduceLanguageControlLabel}"
-      sub-label="$i18n{reduceLanguageDesc}">
-  </settings-toggle-button>
   <div class="settings-box">
     <div class="start">$i18n{adControlLabel}</div>
     <select id="adControlType" class="md-select"
@@ -107,7 +101,7 @@
 </div>
 <settings-animated-pages id="filters" section="shields">
   <div route-path="default">
-    <cr-link-row 
+    <cr-link-row
       id="contentFiltersRow"
       class="hr"
       label="$i18n{adblockContentFilteringLabel}"
diff --git a/browser/ui/webui/settings/brave_settings_localized_strings_provider.cc b/browser/ui/webui/settings/brave_settings_localized_strings_provider.cc
index e6bf2075ae83..98954c608cac 100644
--- a/browser/ui/webui/settings/brave_settings_localized_strings_provider.cc
+++ b/browser/ui/webui/settings/brave_settings_localized_strings_provider.cc
@@ -144,9 +144,6 @@ void BraveAddCommonStrings(content::WebUIDataSource* html_source,
     {"cookieControlLabel", IDS_SETTINGS_BRAVE_SHIELDS_COOKIE_CONTROL_LABEL},
     {"fingerprintingControlLabel",
      IDS_SETTINGS_BRAVE_SHIELDS_FINGERPRINTING_CONTROL_LABEL},
-    {"reduceLanguageControlLabel",
-     IDS_SETTINGS_BRAVE_SHIELDS_REDUCE_LANGUAGE_CONTROL_LABEL},
-    {"reduceLanguageDesc", IDS_SETTINGS_BRAVE_SHIELDS_REDUCE_LANGUAGE_SUBITEM},
     {"httpsEverywhereControlLabel",
      IDS_SETTINGS_BRAVE_SHIELDS_HTTPS_EVERYWHERE_CONTROL_LABEL},
     {"noScriptControlLabel",
diff --git a/chromium_src/third_party/blink/public/platform/web_content_settings_client.h b/chromium_src/third_party/blink/public/platform/web_content_settings_client.h
index e04291632c8e..f0c0d2cea4e8 100644
--- a/chromium_src/third_party/blink/public/platform/web_content_settings_client.h
+++ b/chromium_src/third_party/blink/public/platform/web_content_settings_client.h
@@ -21,7 +21,6 @@ class GURL;
   virtual BraveFarblingLevel GetBraveFarblingLevel() {                       \
     return BraveFarblingLevel::OFF;                                          \
   }                                                                          \
-  virtual bool IsReduceLanguageEnabled() { return false; }                   \
   virtual blink::WebSecurityOrigin GetEphemeralStorageOriginSync() {         \
     return blink::WebSecurityOrigin();                                       \
   }                                                                          \
diff --git a/chromium_src/third_party/blink/renderer/core/core_initializer.cc b/chromium_src/third_party/blink/renderer/core/core_initializer.cc
deleted file mode 100644
index 8a2118a0f274..000000000000
--- a/chromium_src/third_party/blink/renderer/core/core_initializer.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at https://mozilla.org/MPL/2.0/. */
-
-#include "third_party/blink/renderer/bindings/core/v8/binding_security.h"
-#include "third_party/blink/renderer/core/execution_context/execution_context.h"
-
-#define BindingSecurity             \
-  brave::BraveSessionCache::Init(); \
-  BindingSecurity
-
-#include "src/third_party/blink/renderer/core/core_initializer.cc"
diff --git a/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.cc b/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.cc
index 04bd022840fb..e46c484c6ea4 100644
--- a/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.cc
+++ b/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.cc
@@ -6,10 +6,7 @@
 #include "third_party/blink/renderer/core/execution_context/execution_context.h"
 
 #include "base/command_line.h"
-#include "base/sequence_checker.h"
 #include "base/strings/string_number_conversions.h"
-#include "brave/third_party/blink/renderer/brave_farbling_constants.h"
-#include "brave/third_party/blink/renderer/brave_font_whitelist.h"
 #include "crypto/hmac.h"
 #include "third_party/blink/public/platform/web_content_settings_client.h"
 #include "third_party/blink/renderer/core/dom/document.h"
@@ -17,12 +14,10 @@
 #include "third_party/blink/renderer/core/frame/local_frame.h"
 #include "third_party/blink/renderer/core/workers/worker_global_scope.h"
 #include "third_party/blink/renderer/platform/bindings/script_state.h"
-#include "third_party/blink/renderer/platform/fonts/font_fallback_list.h"
 #include "third_party/blink/renderer/platform/graphics/image_data_buffer.h"
 #include "third_party/blink/renderer/platform/graphics/static_bitmap_image.h"
 #include "third_party/blink/renderer/platform/graphics/unaccelerated_static_bitmap_image.h"
 #include "third_party/blink/renderer/platform/heap/garbage_collected.h"
-#include "third_party/blink/renderer/platform/language.h"
 #include "third_party/blink/renderer/platform/network/network_utils.h"
 #include "third_party/blink/renderer/platform/supplementable.h"
 #include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
@@ -108,22 +103,6 @@ bool AllowFingerprinting(ExecutionContext* context) {
   return true;
 }
 
-bool AllowFontFamily(ExecutionContext* context,
-                     const AtomicString& family_name) {
-  if (!context)
-    return true;
-
-  auto* settings = brave::GetContentSettingsClientFor(context);
-  if (!settings)
-    return true;
-
-  if (!brave::BraveSessionCache::From(*context).AllowFontFamily(settings,
-                                                                family_name))
-    return false;
-
-  return true;
-}
-
 BraveSessionCache::BraveSessionCache(ExecutionContext& context)
     : Supplement<ExecutionContext>(context) {
   farbling_enabled_ = false;
@@ -148,17 +127,10 @@ BraveSessionCache::BraveSessionCache(ExecutionContext& context)
           .Utf8();
   if (domain.empty())
     return;
-
   base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
-  base::StringToUint64(
-      cmd_line->HasSwitch(kBraveSessionToken)
-          ? cmd_line->GetSwitchValueASCII(kBraveSessionToken)
-          // https://github.com/brave/brave-browser/issues/22021
-          : "23456",  // this is intentionally different from the test default
-                      // of 12345 so we can still detect any switch issues in
-                      // our farbling tests
-      &session_key_);
-
+  DCHECK(cmd_line->HasSwitch(kBraveSessionToken));
+  base::StringToUint64(cmd_line->GetSwitchValueASCII(kBraveSessionToken),
+                       &session_key_);
   crypto::HMAC h(crypto::HMAC::SHA256);
   CHECK(h.Init(reinterpret_cast<const unsigned char*>(&session_key_),
                sizeof session_key_));
@@ -176,11 +148,6 @@ BraveSessionCache& BraveSessionCache::From(ExecutionContext& context) {
   return *cache;
 }
 
-// static
-void BraveSessionCache::Init() {
-  RegisterAllowFontFamilyCallback(base::BindRepeating(&brave::AllowFontFamily));
-}
-
 AudioFarblingCallback BraveSessionCache::GetAudioFarblingCallback(
     blink::WebContentSettingsClient* settings) {
   if (farbling_enabled_ && settings) {
@@ -296,35 +263,6 @@ WTF::String BraveSessionCache::FarbledUserAgent(WTF::String real_user_agent) {
   return result.ToString();
 }
 
-bool BraveSessionCache::AllowFontFamily(
-    blink::WebContentSettingsClient* settings,
-    const AtomicString& family_name) {
-  if (!CanRestrictFontFamiliesOnThisPlatform() || !farbling_enabled_ ||
-      !settings || !settings->IsReduceLanguageEnabled())
-    return true;
-  switch (settings->GetBraveFarblingLevel()) {
-    case BraveFarblingLevel::OFF:
-      break;
-    case BraveFarblingLevel::BALANCED:
-    case BraveFarblingLevel::MAXIMUM: {
-      if (GetAllowedFontFamilies().contains(family_name.Utf8()))
-        return true;
-#if BUILDFLAG(IS_WIN)
-      WTF::String locale = blink::DefaultLanguage().GetString().Left(2);
-      if (GetAdditionalAllowedFontFamiliesByLocale(locale).contains(
-              family_name.Utf8()))
-        return true;
-#endif
-      FarblingPRNG prng = MakePseudoRandomGenerator();
-      prng.discard(family_name.Impl()->GetHash() % 16);
-      return ((prng() % 2) == 0);
-    }
-    default:
-      NOTREACHED();
-  }
-  return true;
-}
-
 FarblingPRNG BraveSessionCache::MakePseudoRandomGenerator() {
   uint64_t seed = *reinterpret_cast<uint64_t*>(domain_key_);
   return FarblingPRNG(seed);
diff --git a/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.h b/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.h
index d002608dbad2..794f851cfbee 100644
--- a/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.h
+++ b/chromium_src/third_party/blink/renderer/core/execution_context/execution_context.h
@@ -10,8 +10,6 @@
 #include "brave/third_party/blink/renderer/brave_farbling_constants.h"
 #include "src/third_party/blink/renderer/core/execution_context/execution_context.h"
 #include "third_party/abseil-cpp/absl/random/random.h"
-#include "third_party/blink/renderer/core/core_export.h"
-#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
 
 namespace blink {
 class WebContentSettingsClient;
@@ -33,8 +31,6 @@ CORE_EXPORT BraveFarblingLevel
 GetBraveFarblingLevelFor(ExecutionContext* context,
                          BraveFarblingLevel default_value);
 CORE_EXPORT bool AllowFingerprinting(ExecutionContext* context);
-CORE_EXPORT bool AllowFontFamily(ExecutionContext* context,
-                                 const AtomicString& family_name);
 
 class CORE_EXPORT BraveSessionCache final
     : public GarbageCollected<BraveSessionCache>,
@@ -46,7 +42,6 @@ class CORE_EXPORT BraveSessionCache final
   virtual ~BraveSessionCache() = default;
 
   static BraveSessionCache& From(ExecutionContext&);
-  static void Init();
 
   AudioFarblingCallback GetAudioFarblingCallback(
       blink::WebContentSettingsClient* settings);
@@ -55,8 +50,6 @@ class CORE_EXPORT BraveSessionCache final
                      size_t size);
   WTF::String GenerateRandomString(std::string seed, wtf_size_t length);
   WTF::String FarbledUserAgent(WTF::String real_user_agent);
-  bool AllowFontFamily(blink::WebContentSettingsClient* settings,
-                       const AtomicString& family_name);
   FarblingPRNG MakePseudoRandomGenerator();
 
  private:
diff --git a/chromium_src/third_party/blink/renderer/core/frame/navigator_language.cc b/chromium_src/third_party/blink/renderer/core/frame/navigator_language.cc
deleted file mode 100644
index 8e417c9bcd80..000000000000
--- a/chromium_src/third_party/blink/renderer/core/frame/navigator_language.cc
+++ /dev/null
@@ -1,41 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "third_party/blink/renderer/core/frame/navigator_language.h"
-
-#include "third_party/blink/public/platform/web_content_settings_client.h"
-
-#define NavigatorLanguage NavigatorLanguage_ChromiumImpl
-#include "src/third_party/blink/renderer/core/frame/navigator_language.cc"
-#undef NavigatorLanguage
-
-namespace blink {
-
-NavigatorLanguage::NavigatorLanguage(ExecutionContext* execution_context)
-    : NavigatorLanguage_ChromiumImpl(execution_context) {}
-
-void NavigatorLanguage::EnsureUpdatedLanguage() {
-  NavigatorLanguage_ChromiumImpl::EnsureUpdatedLanguage();
-  blink::WebContentSettingsClient* settings =
-      brave::GetContentSettingsClientFor(execution_context_);
-  // If Brave Shields are down or anti-fingerprinting is off for this site,
-  // do nothing.
-  if (!settings || settings->GetBraveFarblingLevel() == BraveFarblingLevel::OFF)
-    return;
-  if (settings->GetBraveFarblingLevel() == BraveFarblingLevel::MAXIMUM) {
-    // If anti-fingerprinting is at maximum, override the entire language list
-    // regardless of locale or other settings.
-    languages_.clear();
-    languages_.push_back("en-US");
-    languages_.push_back("en");
-  } else {
-    // If anti-fingerprinting is on at its default level, remove all but the
-    // first language. (Note: this method requires a non-empty list, which the
-    // upstream code guarantees.)
-    languages_.Shrink(1);
-  }
-}
-
-}  // namespace blink
diff --git a/chromium_src/third_party/blink/renderer/core/frame/navigator_language.h b/chromium_src/third_party/blink/renderer/core/frame/navigator_language.h
deleted file mode 100644
index 966869518ad6..000000000000
--- a/chromium_src/third_party/blink/renderer/core/frame/navigator_language.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef BRAVE_CHROMIUM_SRC_THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_LANGUAGE_H_
-#define BRAVE_CHROMIUM_SRC_THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_LANGUAGE_H_
-
-#define NavigatorLanguage NavigatorLanguage_ChromiumImpl
-#define EnsureUpdatedLanguage \
-  UnusedMethod() {}           \
-                              \
- protected:                   \
-  virtual void EnsureUpdatedLanguage
-
-#include "src/third_party/blink/renderer/core/frame/navigator_language.h"
-
-#undef EnsureUpdatedLanguage
-#undef NavigatorLanguage
-
-namespace blink {
-
-class CORE_EXPORT NavigatorLanguage : public NavigatorLanguage_ChromiumImpl {
- public:
-  explicit NavigatorLanguage(ExecutionContext*);
-
- protected:
-  void EnsureUpdatedLanguage() override;
-};
-
-}  // namespace blink
-
-#endif  // BRAVE_CHROMIUM_SRC_THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_LANGUAGE_H_
diff --git a/chromium_src/third_party/blink/renderer/platform/fonts/font_fallback_list.cc b/chromium_src/third_party/blink/renderer/platform/fonts/font_fallback_list.cc
deleted file mode 100644
index 114b849fd5fd..000000000000
--- a/chromium_src/third_party/blink/renderer/platform/fonts/font_fallback_list.cc
+++ /dev/null
@@ -1,41 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at https://mozilla.org/MPL/2.0/. */
-
-#include "third_party/blink/renderer/platform/fonts/font_fallback_list.h"
-
-#include "base/no_destructor.h"
-#include "third_party/blink/renderer/platform/fonts/font_selector.h"
-#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
-
-namespace brave {
-
-namespace {
-
-AllowFontFamilyCallback* GetAllowFontFamilyCallback() {
-  static base::NoDestructor<AllowFontFamilyCallback> callback;
-  return callback.get();
-}
-
-}  // namespace
-
-void RegisterAllowFontFamilyCallback(AllowFontFamilyCallback callback) {
-  DCHECK(GetAllowFontFamilyCallback()->is_null());
-  *GetAllowFontFamilyCallback() = std::move(callback);
-}
-
-}  // namespace brave
-
-// This only runs if the relevant font selector (CSS or offscreen)
-// does NOT find a matching font, because we want to allow web fonts
-// unconditionally.
-#define BRAVE_GET_FONT_DATA                         \
-  if ((!curr_family->FamilyIsGeneric()) &&          \
-      brave::GetAllowFontFamilyCallback() &&        \
-      !brave::GetAllowFontFamilyCallback()->Run(    \
-          GetFontSelector()->GetExecutionContext(), \
-          curr_family->FamilyName()))               \
-    result = nullptr;
-
-#include "src/third_party/blink/renderer/platform/fonts/font_fallback_list.cc"
diff --git a/chromium_src/third_party/blink/renderer/platform/fonts/font_fallback_list.h b/chromium_src/third_party/blink/renderer/platform/fonts/font_fallback_list.h
deleted file mode 100644
index 01af5f276bf5..000000000000
--- a/chromium_src/third_party/blink/renderer/platform/fonts/font_fallback_list.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at https://mozilla.org/MPL/2.0/. */
-
-#ifndef BRAVE_CHROMIUM_SRC_THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FALLBACK_LIST_H_
-#define BRAVE_CHROMIUM_SRC_THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FALLBACK_LIST_H_
-
-#include "base/callback.h"
-#include "src/third_party/blink/renderer/platform/fonts/font_fallback_list.h"
-#include "third_party/blink/renderer/platform/platform_export.h"
-#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
-
-namespace blink {
-class ExecutionContext;
-}
-
-namespace brave {
-
-typedef base::RepeatingCallback<bool(blink::ExecutionContext*,
-                                     const WTF::AtomicString&)>
-    AllowFontFamilyCallback;
-
-PLATFORM_EXPORT void RegisterAllowFontFamilyCallback(
-    AllowFontFamilyCallback callback);
-
-}  // namespace brave
-
-#endif  // BRAVE_CHROMIUM_SRC_THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_FALLBACK_LIST_H_
diff --git a/components/brave_shields/browser/BUILD.gn b/components/brave_shields/browser/BUILD.gn
index aa6b9130a24a..05a2191f5e32 100644
--- a/components/brave_shields/browser/BUILD.gn
+++ b/components/brave_shields/browser/BUILD.gn
@@ -39,8 +39,6 @@ static_library("browser") {
     "base_brave_shields_service.h",
     "blocked_domain_1pes_lifetime.cc",
     "blocked_domain_1pes_lifetime.h",
-    "brave_farbling_service.cc",
-    "brave_farbling_service.h",
     "brave_shields_p3a.cc",
     "brave_shields_p3a.h",
     "brave_shields_util.cc",
@@ -74,7 +72,6 @@ static_library("browser") {
     "//components/component_updater:component_updater",
     "//components/content_settings/core/browser",
     "//components/content_settings/core/common",
-    "//components/pref_registry:pref_registry",
     "//components/prefs",
     "//components/security_interstitials/content:security_interstitial_page",
     "//components/security_interstitials/core",
diff --git a/components/brave_shields/browser/brave_farbling_service.cc b/components/brave_shields/browser/brave_farbling_service.cc
deleted file mode 100644
index 349d74be92d1..000000000000
--- a/components/brave_shields/browser/brave_farbling_service.cc
+++ /dev/null
@@ -1,67 +0,0 @@
-/* Copyright 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/components/brave_shields/browser/brave_farbling_service.h"
-
-#include <string>
-
-#include "base/rand_util.h"
-#include "brave/components/brave_shields/common/pref_names.h"
-#include "components/pref_registry/pref_registry_syncable.h"
-#include "crypto/hmac.h"
-#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
-#include "url/gurl.h"
-
-namespace brave {
-
-BraveFarblingService::BraveFarblingService() {
-  // initialize random seeds for farbling
-  session_token_ = base::RandUint64();
-  incognito_session_token_ = base::RandUint64();
-}
-
-BraveFarblingService::~BraveFarblingService() {}
-
-uint64_t BraveFarblingService::session_token(bool is_off_the_record) {
-  if (is_off_the_record)
-    return incognito_session_token_;
-  return session_token_;
-}
-
-void BraveFarblingService::set_session_tokens_for_testing(
-    uint64_t session_token,
-    uint64_t incognito_session_token) {
-  session_token_ = session_token;
-  incognito_session_token_ = incognito_session_token;
-}
-
-bool BraveFarblingService::MakePseudoRandomGeneratorForURL(
-    const GURL& url,
-    bool is_off_the_record,
-    FarblingPRNG* prng) {
-  const std::string domain =
-      net::registry_controlled_domains::GetDomainAndRegistry(
-          url, net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
-  if (domain.empty())
-    return false;
-  uint8_t domain_key[32];
-  uint64_t session_key = session_token(is_off_the_record);
-  crypto::HMAC h(crypto::HMAC::SHA256);
-  CHECK(h.Init(reinterpret_cast<const unsigned char*>(&session_key),
-               sizeof session_key));
-  CHECK(h.Sign(domain, domain_key, sizeof domain_key));
-  uint64_t seed = *reinterpret_cast<uint64_t*>(domain_key);
-  *prng = FarblingPRNG(seed);
-  return true;
-}
-
-// static
-void BraveFarblingService::RegisterProfilePrefs(
-    user_prefs::PrefRegistrySyncable* registry) {
-  registry->RegisterBooleanPref(brave_shields::prefs::kReduceLanguageEnabled,
-                                true);
-}
-
-}  // namespace brave
diff --git a/components/brave_shields/browser/brave_farbling_service.h b/components/brave_shields/browser/brave_farbling_service.h
deleted file mode 100644
index 7069204df1b2..000000000000
--- a/components/brave_shields/browser/brave_farbling_service.h
+++ /dev/null
@@ -1,42 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_BRAVE_FARBLING_SERVICE_H_
-#define BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_BRAVE_FARBLING_SERVICE_H_
-
-#include "third_party/abseil-cpp/absl/random/random.h"
-
-class GURL;
-
-namespace user_prefs {
-class PrefRegistrySyncable;
-}
-
-namespace brave {
-
-typedef absl::randen_engine<uint64_t> FarblingPRNG;
-
-class BraveFarblingService {
- public:
-  BraveFarblingService();
-  ~BraveFarblingService();
-
-  uint64_t session_token(bool is_off_the_record);
-  void set_session_tokens_for_testing(uint64_t session_token,
-                                      uint64_t incognito_session_token);
-  bool MakePseudoRandomGeneratorForURL(const GURL& url,
-                                       bool is_off_the_record,
-                                       FarblingPRNG* prng);
-
-  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
-
- private:
-  uint64_t session_token_;
-  uint64_t incognito_session_token_;
-};
-
-}  // namespace brave
-
-#endif  // BRAVE_COMPONENTS_BRAVE_SHIELDS_BROWSER_BRAVE_FARBLING_SERVICE_H_
diff --git a/components/brave_shields/browser/brave_farbling_service_unittest.cc b/components/brave_shields/browser/brave_farbling_service_unittest.cc
deleted file mode 100644
index 21e53f97c1b9..000000000000
--- a/components/brave_shields/browser/brave_farbling_service_unittest.cc
+++ /dev/null
@@ -1,99 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include <memory>
-#include <tuple>
-
-#include "brave/components/brave_shields/browser/brave_farbling_service.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "third_party/abseil-cpp/absl/random/random.h"
-#include "url/gurl.h"
-
-namespace {
-const uint64_t kTestSessionToken = 123456789;
-const uint64_t kTestIncognitoSessionToken = 234567890;
-const uint64_t kAnotherTestSessionToken = 45678;
-const uint64_t kAnotherTestIncognitoSessionToken = 56789;
-}  // namespace
-
-class BraveFarblingServiceTest : public testing::Test {
- public:
-  BraveFarblingServiceTest() = default;
-  BraveFarblingServiceTest(const BraveFarblingServiceTest&) = delete;
-  BraveFarblingServiceTest& operator=(const BraveFarblingServiceTest&) = delete;
-  ~BraveFarblingServiceTest() override = default;
-
-  void SetUp() override {
-    farbling_service_ = std::make_unique<brave::BraveFarblingService>();
-    farbling_service_->set_session_tokens_for_testing(
-        kTestSessionToken, kTestIncognitoSessionToken);
-  }
-
-  brave::BraveFarblingService* farbling_service() {
-    return farbling_service_.get();
-  }
-
- private:
-  std::unique_ptr<brave::BraveFarblingService> farbling_service_;
-};
-
-TEST_F(BraveFarblingServiceTest, SessionTokens) {
-  EXPECT_EQ(farbling_service()->session_token(false /* is_off_the_record */),
-            kTestSessionToken);
-  EXPECT_EQ(farbling_service()->session_token(true /* is_off_the_record */),
-            kTestIncognitoSessionToken);
-}
-
-TEST_F(BraveFarblingServiceTest, PRNGKnownValues) {
-  const std::array<std::tuple<GURL, bool, uint64_t>, 4> test_cases = {
-      std::make_tuple<>(GURL("http://a.com"), false, 16188622623906601575UL),
-      std::make_tuple<>(GURL("http://a.com"), true, 8942885125771927068UL),
-      std::make_tuple<>(GURL("http://b.com"), false, 10059331952077172763UL),
-      std::make_tuple<>(GURL("http://b.com"), true, 6702825749149599294UL),
-  };
-  for (const auto& c : test_cases) {
-    brave::FarblingPRNG prng;
-    ASSERT_TRUE(farbling_service()->MakePseudoRandomGeneratorForURL(
-        std::get<0>(c), std::get<1>(c), &prng));
-    EXPECT_EQ(prng(), std::get<2>(c));
-  }
-}
-
-TEST_F(BraveFarblingServiceTest, PRNGKnownValuesDifferentSeeds) {
-  farbling_service()->set_session_tokens_for_testing(
-      kAnotherTestSessionToken, kAnotherTestIncognitoSessionToken);
-  const std::array<std::tuple<GURL, bool, uint64_t>, 4> test_cases = {
-      std::make_tuple<>(GURL("http://a.com"), false, 6565599272117158152UL),
-      std::make_tuple<>(GURL("http://a.com"), true, 18152828989207203999UL),
-      std::make_tuple<>(GURL("http://b.com"), false, 10499595974068024348UL),
-      std::make_tuple<>(GURL("http://b.com"), true, 7485037097853289552UL),
-  };
-  for (const auto& c : test_cases) {
-    brave::FarblingPRNG prng;
-    ASSERT_TRUE(farbling_service()->MakePseudoRandomGeneratorForURL(
-        std::get<0>(c), std::get<1>(c), &prng));
-    EXPECT_EQ(prng(), std::get<2>(c));
-  }
-}
-
-TEST_F(BraveFarblingServiceTest, InvalidDomains) {
-  const std::array<GURL, 8> test_cases = {
-      GURL("about:blank"),
-      GURL("brave://settings"),
-      GURL("chrome://version"),
-      GURL("gopher://brave.com"),
-      GURL("file:///etc/passwd"),
-      GURL("javascript:alert(1)"),
-      GURL("data:text/plain;base64,"),
-      GURL(""),
-  };
-  for (const auto& url : test_cases) {
-    brave::FarblingPRNG prng;
-    EXPECT_FALSE(
-        farbling_service()->MakePseudoRandomGeneratorForURL(url, false, &prng));
-    EXPECT_FALSE(
-        farbling_service()->MakePseudoRandomGeneratorForURL(url, true, &prng));
-  }
-}
diff --git a/components/brave_shields/browser/brave_shields_util.cc b/components/brave_shields/browser/brave_shields_util.cc
index 85be175370b0..795b23f8612d 100644
--- a/components/brave_shields/browser/brave_shields_util.cc
+++ b/components/brave_shields/browser/brave_shields_util.cc
@@ -14,7 +14,6 @@
 #include "brave/components/brave_shields/common/brave_shield_constants.h"
 #include "brave/components/brave_shields/common/brave_shield_utils.h"
 #include "brave/components/brave_shields/common/features.h"
-#include "brave/components/brave_shields/common/pref_names.h"
 #include "brave/components/content_settings/core/common/content_settings_util.h"
 #include "brave/components/debounce/common/features.h"
 #include "components/content_settings/core/browser/cookie_settings.h"
@@ -341,37 +340,6 @@ bool ShouldDoDebouncing(HostContentSettingsMap* map, const GURL& url) {
   return true;
 }
 
-bool IsReduceLanguageEnabledForProfile(PrefService* pref_service) {
-  // Don't reduce language if feature is disabled
-  if (!base::FeatureList::IsEnabled(features::kBraveReduceLanguage))
-    return false;
-
-  // Don't reduce language if user preference is unchecked
-  if (!pref_service->GetBoolean(brave_shields::prefs::kReduceLanguageEnabled))
-    return false;
-
-  return true;
-}
-
-bool ShouldDoReduceLanguage(HostContentSettingsMap* map,
-                            const GURL& url,
-                            PrefService* pref_service) {
-  if (!IsReduceLanguageEnabledForProfile(pref_service))
-    return false;
-
-  // Don't reduce language if Brave Shields is down (this also handles cases
-  // where the URL is not HTTP(S))
-  if (!brave_shields::GetBraveShieldsEnabled(map, url))
-    return false;
-
-  // Don't reduce language if fingerprinting is off
-  if (brave_shields::GetFingerprintingControlType(map, url) ==
-      ControlType::ALLOW)
-    return false;
-
-  return true;
-}
-
 DomainBlockingType GetDomainBlockingType(HostContentSettingsMap* map,
                                          const GURL& url) {
   // Don't block if feature is disabled
diff --git a/components/brave_shields/browser/brave_shields_util.h b/components/brave_shields/browser/brave_shields_util.h
index 7b34b7175704..44001adcdadf 100644
--- a/components/brave_shields/browser/brave_shields_util.h
+++ b/components/brave_shields/browser/brave_shields_util.h
@@ -79,12 +79,6 @@ bool IsFirstPartyCosmeticFilteringEnabled(HostContentSettingsMap* map,
 
 bool ShouldDoDebouncing(HostContentSettingsMap* map, const GURL& url);
 
-bool IsReduceLanguageEnabledForProfile(PrefService* pref_service);
-
-bool ShouldDoReduceLanguage(HostContentSettingsMap* map,
-                            const GURL& url,
-                            PrefService* pref_service);
-
 DomainBlockingType GetDomainBlockingType(HostContentSettingsMap* map,
                                          const GURL& url);
 
diff --git a/components/brave_shields/common/brave_shields.mojom b/components/brave_shields/common/brave_shields.mojom
index de477cff7760..634a2167d7fb 100644
--- a/components/brave_shields/common/brave_shields.mojom
+++ b/components/brave_shields/common/brave_shields.mojom
@@ -16,8 +16,4 @@ interface BraveShields {
   // Tell the associated RenderFrame(s) to temporary allow scripts from a list
   // of origins once.
   SetAllowScriptsFromOriginsOnce(array<string> origins);
-
-  // Tell the associated RenderFrame(s) whether "reduce language
-  // identifiability" is enabled.
-  SetReduceLanguageEnabled(bool enabled);
 };
diff --git a/components/brave_shields/common/features.cc b/components/brave_shields/common/features.cc
index c1d4f92723c9..9bc6309ace3d 100644
--- a/components/brave_shields/common/features.cc
+++ b/components/brave_shields/common/features.cc
@@ -51,9 +51,6 @@ const base::Feature kBraveDomainBlock1PES{"BraveDomainBlock1PES",
 // potentially blocked by Brave Shields.
 const base::Feature kBraveExtensionNetworkBlocking{
     "BraveExtensionNetworkBlocking", base::FEATURE_DISABLED_BY_DEFAULT};
-// When enabled, language headers and APIs may be altered by Brave Shields.
-const base::Feature kBraveReduceLanguage{"BraveReduceLanguage",
-                                         base::FEATURE_ENABLED_BY_DEFAULT};
 // When enabled, Brave will always report Light in Fingerprinting: Strict mode
 const base::Feature kBraveDarkModeBlock{"BraveDarkModeBlock",
                                         base::FEATURE_ENABLED_BY_DEFAULT};
diff --git a/components/brave_shields/common/features.h b/components/brave_shields/common/features.h
index 8b6d65f79657..694a12c6bd2e 100644
--- a/components/brave_shields/common/features.h
+++ b/components/brave_shields/common/features.h
@@ -21,7 +21,6 @@ extern const base::Feature kBraveAdblockCspRules;
 extern const base::Feature kBraveDomainBlock;
 extern const base::Feature kBraveDomainBlock1PES;
 extern const base::Feature kBraveExtensionNetworkBlocking;
-extern const base::Feature kBraveReduceLanguage;
 extern const base::Feature kBraveDarkModeBlock;
 extern const base::Feature kCosmeticFilteringSyncLoad;
 extern const base::Feature kBraveShieldsPanelV1;
diff --git a/components/brave_shields/common/pref_names.cc b/components/brave_shields/common/pref_names.cc
index 8492b74a804b..fa5d9a7c0c55 100644
--- a/components/brave_shields/common/pref_names.cc
+++ b/components/brave_shields/common/pref_names.cc
@@ -18,7 +18,6 @@ const char kAdBlockListSubscriptions[] = "brave.ad_block.list_subscriptions";
 const char kFBEmbedControlType[] = "brave.fb_embed_default";
 const char kTwitterEmbedControlType[] = "brave.twitter_embed_default";
 const char kLinkedInEmbedControlType[] = "brave.linkedin_embed_default";
-const char kReduceLanguageEnabled[] = "brave.reduce_language";
 
 }  // namespace prefs
 }  // namespace brave_shields
diff --git a/components/brave_shields/common/pref_names.h b/components/brave_shields/common/pref_names.h
index f6bacde55a93..b58d16a2d50c 100644
--- a/components/brave_shields/common/pref_names.h
+++ b/components/brave_shields/common/pref_names.h
@@ -17,7 +17,6 @@ extern const char kAdBlockListSubscriptions[];
 extern const char kFBEmbedControlType[];
 extern const char kTwitterEmbedControlType[];
 extern const char kLinkedInEmbedControlType[];
-extern const char kReduceLanguageEnabled[];
 
 }  // namespace prefs
 }  // namespace brave_shields
diff --git a/components/content_settings/renderer/brave_content_settings_agent_impl.cc b/components/content_settings/renderer/brave_content_settings_agent_impl.cc
index 077d789e6710..f17be5584ca6 100644
--- a/components/content_settings/renderer/brave_content_settings_agent_impl.cc
+++ b/components/content_settings/renderer/brave_content_settings_agent_impl.cc
@@ -108,10 +108,6 @@ bool BraveContentSettingsAgentImpl::IsScriptTemporilyAllowed(
   return allow;
 }
 
-bool BraveContentSettingsAgentImpl::IsReduceLanguageEnabled() {
-  return reduce_language_enabled_;
-}
-
 void BraveContentSettingsAgentImpl::BraveSpecificDidBlockJavaScript(
     const std::u16string& details) {
   mojo::AssociatedRemote<brave_shields::mojom::BraveShieldsHost> remote;
@@ -355,10 +351,6 @@ void BraveContentSettingsAgentImpl::SetAllowScriptsFromOriginsOnce(
   temporarily_allowed_scripts_ = origins;
 }
 
-void BraveContentSettingsAgentImpl::SetReduceLanguageEnabled(bool enabled) {
-  reduce_language_enabled_ = enabled;
-}
-
 void BraveContentSettingsAgentImpl::BindBraveShieldsReceiver(
     mojo::PendingAssociatedReceiver<brave_shields::mojom::BraveShields>
         pending_receiver) {
diff --git a/components/content_settings/renderer/brave_content_settings_agent_impl.h b/components/content_settings/renderer/brave_content_settings_agent_impl.h
index 723004e3aa88..d5f53638b1fb 100644
--- a/components/content_settings/renderer/brave_content_settings_agent_impl.h
+++ b/components/content_settings/renderer/brave_content_settings_agent_impl.h
@@ -64,8 +64,6 @@ class BraveContentSettingsAgentImpl
 
   BraveFarblingLevel GetBraveFarblingLevel() override;
 
-  bool IsReduceLanguageEnabled() override;
-
  private:
   FRIEND_TEST_ALL_PREFIXES(BraveContentSettingsAgentImplAutoplayBrowserTest,
                            AutoplayBlockedByDefault);
@@ -80,7 +78,6 @@ class BraveContentSettingsAgentImpl
   // brave_shields::mojom::BraveShields.
   void SetAllowScriptsFromOriginsOnce(
       const std::vector<std::string>& origins) override;
-  void SetReduceLanguageEnabled(bool enabled) override;
 
   void BindBraveShieldsReceiver(
       mojo::PendingAssociatedReceiver<brave_shields::mojom::BraveShields>
@@ -98,9 +95,6 @@ class BraveContentSettingsAgentImpl
   // cache blocked script url which will later be used in `DidNotAllowScript()`
   GURL blocked_script_url_;
 
-  // Status of "reduce language identifiability" feature.
-  bool reduce_language_enabled_;
-
   base::flat_map<url::Origin, blink::WebSecurityOrigin>
       cached_ephemeral_storage_origins_;
 
diff --git a/patches/third_party-blink-renderer-platform-fonts-font_fallback_list.cc.patch b/patches/third_party-blink-renderer-platform-fonts-font_fallback_list.cc.patch
deleted file mode 100644
index 1ca71bd9a1a9..000000000000
--- a/patches/third_party-blink-renderer-platform-fonts-font_fallback_list.cc.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff --git a/third_party/blink/renderer/platform/fonts/font_fallback_list.cc b/third_party/blink/renderer/platform/fonts/font_fallback_list.cc
-index f6a360913eb603c17e9cb5edf27c419c49ecfaed..221fa5f0fb0ba06d7a9c747855b7dc6bc2b2551c 100644
---- a/third_party/blink/renderer/platform/fonts/font_fallback_list.cc
-+++ b/third_party/blink/renderer/platform/fonts/font_fallback_list.cc
-@@ -178,6 +178,7 @@ scoped_refptr<FontData> FontFallbackList::GetFontData(
-         GetFontSelector()->ReportFontLookupByUniqueOrFamilyName(
-             curr_family->FamilyName(), font_description,
-             DynamicTo<SimpleFontData>(result.get()));
-+        BRAVE_GET_FONT_DATA
-       }
-       if (result) {
-         GetFontSelector()->ReportSuccessfulFontFamilyMatch(
diff --git a/test/BUILD.gn b/test/BUILD.gn
index 7435470f713f..6f68e44fdc0b 100644
--- a/test/BUILD.gn
+++ b/test/BUILD.gn
@@ -120,7 +120,6 @@ test("brave_unit_tests") {
     "//brave/components/brave_search/browser/brave_search_fallback_host_unittest.cc",
     "//brave/components/brave_shields/browser/ad_block_regional_service_unittest.cc",
     "//brave/components/brave_shields/browser/adblock_stub_response_unittest.cc",
-    "//brave/components/brave_shields/browser/brave_farbling_service_unittest.cc",
     "//brave/components/brave_shields/browser/cosmetic_merge_unittest.cc",
     "//brave/components/brave_shields/browser/csp_merge_unittest.cc",
     "//brave/components/brave_shields/browser/https_everywhere_recently_used_cache_unittest.cpp",
@@ -140,7 +139,6 @@ test("brave_unit_tests") {
     "//brave/components/time_period_storage/daily_storage_unittest.cc",
     "//brave/components/time_period_storage/time_period_storage_unittest.cc",
     "//brave/components/time_period_storage/weekly_event_storage_unittest.cc",
-    "//brave/third_party/blink/renderer/brave_font_whitelist_unittest.cc",
     "//brave/third_party/libaddressinput/chromium/chrome_metadata_source_unittest.cc",
     "//brave/vendor/brave_base/random_unittest.cc",
     "//chrome/browser/signin/test_signin_client_builder.cc",
@@ -249,7 +247,6 @@ test("brave_unit_tests") {
     "//brave/extensions:common",
     "//brave/mojo/brave_ast_patcher:unit_tests",
     "//brave/net:unit_tests",
-    "//brave/third_party/blink/renderer:renderer",
     "//brave/vendor/bat-native-ledger/test:bat_native_ledger_tests",
     "//brave/vendor/brave_base",
     "//chrome:dependencies",
diff --git a/test/base/testing_brave_browser_process.cc b/test/base/testing_brave_browser_process.cc
index 24353ee34e30..0dda32d06a4a 100644
--- a/test/base/testing_brave_browser_process.cc
+++ b/test/base/testing_brave_browser_process.cc
@@ -132,12 +132,6 @@ brave_ads::ResourceComponent* TestingBraveBrowserProcess::resource_component() {
   return nullptr;
 }
 
-brave::BraveFarblingService*
-TestingBraveBrowserProcess::brave_farbling_service() {
-  NOTREACHED();
-  return nullptr;
-}
-
 void TestingBraveBrowserProcess::SetAdBlockService(
     std::unique_ptr<brave_shields::AdBlockService> service) {
   ad_block_service_ = std::move(service);
diff --git a/test/base/testing_brave_browser_process.h b/test/base/testing_brave_browser_process.h
index 1f409d7e1c83..5e034a09e627 100644
--- a/test/base/testing_brave_browser_process.h
+++ b/test/base/testing_brave_browser_process.h
@@ -69,7 +69,6 @@ class TestingBraveBrowserProcess : public BraveBrowserProcess {
       override;
 #endif
   brave_ads::ResourceComponent* resource_component() override;
-  brave::BraveFarblingService* brave_farbling_service() override;
 
   // Populate the mock process with services. Consumer is responsible for
   // cleaning these up after completion of a test.
diff --git a/test/data/navigator/service-workers-languages.html b/test/data/navigator/service-workers-languages.html
deleted file mode 100644
index 200d7e7c1159..000000000000
--- a/test/data/navigator/service-workers-languages.html
+++ /dev/null
@@ -1,25 +0,0 @@
-<!DOCTYPE html>
-<!-- navigator.languages test from service worker -->
-<html>
-  <head>
-    <title></title>
-    <meta charset="utf-8">
-  </head>
-  <body>
-    <script>
-      navigator.serviceWorker.register('service-workers-languages.js')
-      navigator.serviceWorker.onmessage = function (e) {
-        if (navigator.languages.toString() == e.data) {
-          document.title = "pass";
-        } else {
-          document.title = "got " + e.data;
-        }
-      };
-      navigator.serviceWorker.ready.then(function(registration) {
-        if (!navigator.serviceWorker.controller)
-          window.location.reload();
-        navigator.serviceWorker.controller.postMessage("generate");
-      });
-    </script>
-  </body>
-</html>
diff --git a/test/data/navigator/service-workers-languages.js b/test/data/navigator/service-workers-languages.js
deleted file mode 100644
index 83e42ca12ea6..000000000000
--- a/test/data/navigator/service-workers-languages.js
+++ /dev/null
@@ -1,11 +0,0 @@
-self.addEventListener('install', function(event) {
-  event.waitUntil(self.skipWaiting()); // Activate worker immediately
-});
-
-self.addEventListener('activate', function(event) {
-  event.waitUntil(self.clients.claim()); // Become available to all pages
-});
-self.addEventListener('message', async event => {
-  const client = await clients.get(event.source.id)
-  client.postMessage(navigator.languages.toString());
-});
diff --git a/test/data/navigator/workers-languages.html b/test/data/navigator/workers-languages.html
deleted file mode 100644
index effd72c2e901..000000000000
--- a/test/data/navigator/workers-languages.html
+++ /dev/null
@@ -1,28 +0,0 @@
-<!DOCTYPE html>
-<!-- navigator.languages test from workers -->
-<html>
-  <head>
-    <title></title>
-    <meta charset="utf-8">
-</head>
-<body>
-  <script>
-    var worker = function() {
-      postMessage(navigator.languages.toString());
-    }
-
-    var workerBlob = new Blob(['(' + worker.toString() + ')()'], {
-        type: "text/javascript"
-    });
-
-    worker = new Worker(window.URL.createObjectURL(workerBlob));
-    worker.onmessage = function (e) {
-      if (navigator.languages == e.data) {
-        document.title = "pass";
-      } else {
-        document.title = e.data;
-      }
-    };
-  </script>
-</body>
-</html>
diff --git a/third_party/blink/renderer/BUILD.gn b/third_party/blink/renderer/BUILD.gn
index 2e5be029e175..41aac3e98580 100644
--- a/third_party/blink/renderer/BUILD.gn
+++ b/third_party/blink/renderer/BUILD.gn
@@ -6,9 +6,9 @@
 source_set("renderer") {
   sources = [
     "brave_farbling_constants.h",
-    "brave_font_whitelist.cc",
-    "brave_font_whitelist.h",
   ]
 
-  deps = [ "//brave/components/brave_drm:brave_drm_blink" ]
+  deps = [
+    "//brave/components/brave_drm:brave_drm_blink",
+  ]
 }
diff --git a/third_party/blink/renderer/DEPS b/third_party/blink/renderer/DEPS
deleted file mode 100644
index c79f0a833681..000000000000
--- a/third_party/blink/renderer/DEPS
+++ /dev/null
@@ -1,3 +0,0 @@
-include_rules = [
-  "+third_party/blink/renderer/platform/wtf/text",
-]
diff --git a/third_party/blink/renderer/brave_font_whitelist.cc b/third_party/blink/renderer/brave_font_whitelist.cc
deleted file mode 100644
index e7d48d729b86..000000000000
--- a/third_party/blink/renderer/brave_font_whitelist.cc
+++ /dev/null
@@ -1,800 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "brave/third_party/blink/renderer/brave_font_whitelist.h"
-
-#include <vector>
-
-namespace brave {
-
-namespace {
-
-base::flat_set<base::StringPiece> kEmptyFontSet =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-
-#if BUILDFLAG(IS_MAC)
-bool kCanRestrictFonts = true;
-// This list covers the fonts installed by default on Mac OS as of Mac OS 12.3.
-base::flat_set<base::StringPiece> kAllowedFontFamilies =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "Academy Engraved LET",
-        "Al Bayan",
-        "Al Nile",
-        "Al Tarikh",
-        "American Typewriter",
-        "Andale Mono",
-        "Apple Braille Outline 6 Dot",
-        "Apple Braille Outline 8 Dot",
-        "Apple Braille Pinpoint 6 Dot",
-        "Apple Braille Pinpoint 8 Dot",
-        "Apple Braille",
-        "Apple Chancery",
-        "Apple Color Emoji",
-        "Apple SD Gothic Neo",
-        "Apple Symbols",
-        "AppleGothic",
-        "AppleMyungjo",
-        "AquaKana",
-        "Arial Black",
-        "Arial Hebrew Scholar",
-        "Arial Hebrew",
-        "Arial Narrow",
-        "Arial Rounded MT Bold",
-        "Arial Unicode MS",
-        "Arial",
-        "Athelas",
-        "Avenir Black Oblique",
-        "Avenir Black",
-        "Avenir Book",
-        "Avenir Heavy",
-        "Avenir Light",
-        "Avenir Medium",
-        "Avenir Next Condensed Demi Bold",
-        "Avenir Next Condensed Heavy",
-        "Avenir Next Condensed Medium",
-        "Avenir Next Condensed Ultra Light",
-        "Avenir Next Condensed",
-        "Avenir Next Demi Bold",
-        "Avenir Next Heavy",
-        "Avenir Next Medium",
-        "Avenir Next Ultra Light",
-        "Avenir Next",
-        "Avenir",
-        "Ayuthaya",
-        "Baghdad",
-        "Bangla MN",
-        "Bangla Sangam MN",
-        "Baskerville",
-        "Beirut",
-        "Big Caslon",
-        "Bodoni 72",
-        "Bodoni 72 Oldstyle",
-        "Bodoni 72 Smallcaps",
-        "Bodoni Ornaments",
-        "Bradley Hand",
-        "Brush Script MT",
-        "Chalkboard SE",
-        "Chalkboard",
-        "Chalkduster",
-        "Charter Black",
-        "Charter",
-        "Cochin",
-        "Comic Sans MS",
-        "Copperplate",
-        "Corsiva Hebrew",
-        "Courier New",
-        "DIN Alternate",
-        "DIN Condensed",
-        "Damascus",
-        "DecoType Naskh",
-        "Devanagari MT",
-        "Devanagari Sangam MN",
-        "Didot",
-        "Diwan Kufi",
-        "Diwan Thuluth",
-        "Euphemia UCAS",
-        "Farah",
-        "Farisi",
-        "Futura",
-        "GB18030 Bitmap",
-        "Galvji",
-        "Geeza Pro",
-        "Geneva",
-        "Georgia",
-        "Gill Sans",
-        "Grantha Sangam MN",
-        "Gujarati MT",
-        "Gujarati Sangam MN",
-        "Gurmukhi MN",
-        "Gurmukhi MT",
-        "Gurmukhi Sangam MN",
-        "Heiti SC",
-        "Heiti TC",
-        "Helvetica",
-        "Helvetica Neue",
-        "Herculanum",
-        "Hiragino Kaku Gothic Pro W3",
-        "Hiragino Kaku Gothic Pro W6",
-        "Hiragino Kaku Gothic Pro",
-        "Hiragino Kaku Gothic ProN W3",
-        "Hiragino Kaku Gothic ProN W6",
-        "Hiragino Kaku Gothic ProN",
-        "Hiragino Kaku Gothic Std W8",
-        "Hiragino Kaku Gothic Std",
-        "Hiragino Kaku Gothic StdN W8",
-        "Hiragino Kaku Gothic StdN",
-        "Hiragino Maru Gothic Pro W4",
-        "Hiragino Maru Gothic Pro",
-        "Hiragino Maru Gothic ProN W4",
-        "Hiragino Maru Gothic ProN",
-        "Hiragino Mincho Pro W3",
-        "Hiragino Mincho Pro W6",
-        "Hiragino Mincho Pro",
-        "Hiragino Mincho ProN W3",
-        "Hiragino Mincho ProN W6",
-        "Hiragino Mincho ProN",
-        "Hiragino Sans GB W3",
-        "Hiragino Sans GB W6",
-        "Hiragino Sans GB",
-        "Hiragino Sans W0",
-        "Hiragino Sans W1",
-        "Hiragino Sans W2",
-        "Hiragino Sans W3",
-        "Hiragino Sans W4",
-        "Hiragino Sans W5",
-        "Hiragino Sans W6",
-        "Hiragino Sans W7",
-        "Hiragino Sans W8",
-        "Hiragino Sans W9",
-        "Hiragino Sans",
-        "Hoefler Text Ornaments",
-        "Hoefler Text",
-        "ITF Devanagari Marathi",
-        "ITF Devanagari",
-        "Impact",
-        "InaiMathi",
-        "Iowan Old Style Black",
-        "Iowan Old Style",
-        "Kailasa",
-        "Kannada MN",
-        "Kannada Sangam MN",
-        "Kefa",
-        "Khmer MN",
-        "Khmer Sangam MN",
-        "Kohinoor Bangla",
-        "Kohinoor Devanagari",
-        "Kohinoor Gujarati",
-        "Kohinoor Telugu",
-        "Kokonor",
-        "Krungthep",
-        "KufiStandardGK",
-        "Lao MN",
-        "Lao Sangam MN",
-        "LastResort",
-        "Lucida Grande",
-        "Luminari",
-        "Malayalam MN",
-        "Malayalam Sangam MN",
-        "Marion",
-        "Marker Felt",
-        "Menlo",
-        "Microsoft Sans Serif",
-        "Mishafi Gold",
-        "Mishafi",
-        "Monaco",
-        "Mshtakan",
-        "Mukta Mahee",
-        "Muna",
-        "Myanmar MN",
-        "Myanmar Sangam MN",
-        "Nadeem",
-        "New Peninim MT",
-        "Noteworthy",
-        "Noto Nastaliq Urdu",
-        "Noto Sans Gothic",
-        "Noto Sans Linear A",
-        "Noto Sans Linear B",
-        "Noto Sans Old Italic",
-        "Noto Serif Ahom",
-        "Noto Serif Balinese",
-        "Noto Serif Myanmar",
-        "Optima",
-        "Oriya MN",
-        "Oriya Sangam MN",
-        "PT Mono",
-        "PT Sans Caption",
-        "PT Sans Narrow",
-        "PT Sans",
-        "PT Serif Caption",
-        "PT Serif",
-        "Palatino",
-        "Papyrus",
-        "Party LET",
-        "Phosphate",
-        "PingFang HK",
-        "PingFang SC",
-        "PingFang TC",
-        "Plantagenet Cherokee",
-        "Raanana",
-        "Rockwell",
-        "STIXGeneral",
-        "STIXGeneral-Bold",
-        "STIXGeneral-BoldItalic",
-        "STIXGeneral-Italic",
-        "STIXGeneral-Regular",
-        "STIXIntegralsD",
-        "STIXIntegralsD-Bold",
-        "STIXIntegralsD-Regular",
-        "STIXIntegralsSm",
-        "STIXIntegralsSm-Bold",
-        "STIXIntegralsSm-Regular",
-        "STIXIntegralsUp",
-        "STIXIntegralsUp-Bold",
-        "STIXIntegralsUp-Regular",
-        "STIXIntegralsUpD",
-        "STIXIntegralsUpD-Bold",
-        "STIXIntegralsUpD-Regular",
-        "STIXIntegralsUpSm",
-        "STIXIntegralsUpSm-Bold",
-        "STIXIntegralsUpSm-Regular",
-        "STIXNonUnicode",
-        "STIXNonUnicode-Bold",
-        "STIXNonUnicode-BoldItalic",
-        "STIXNonUnicode-Italic",
-        "STIXNonUnicode-Regular",
-        "STIXSizeFiveSym",
-        "STIXSizeFiveSym-Regular",
-        "STIXSizeFourSym",
-        "STIXSizeFourSym-Bold",
-        "STIXSizeFourSym-Regular",
-        "STIXSizeOneSym",
-        "STIXSizeOneSym-Bold",
-        "STIXSizeOneSym-Regular",
-        "STIXSizeThreeSym",
-        "STIXSizeThreeSym-Bold",
-        "STIXSizeThreeSym-Regular",
-        "STIXSizeTwoSym",
-        "STIXSizeTwoSym-Bold",
-        "STIXSizeTwoSym-Regular",
-        "STIXVariants",
-        "STIXVariants-Bold",
-        "STIXVariants-Regular",
-        "STSong",
-        "Sana",
-        "Sathu",
-        "Savoye LET Plain CC.:1.0",
-        "Savoye LET Plain:1.0",
-        "Savoye LET",
-        "Seravek ExtraLight",
-        "Seravek Light",
-        "Seravek Medium",
-        "Seravek",
-        "Shree Devanagari 714",
-        "SignPainter",
-        "SignPainter-HouseScript",
-        "Silom",
-        "Sinhala MN",
-        "Sinhala Sangam MN",
-        "Skia",
-        "Snell Roundhand",
-        "Songti SC",
-        "Songti TC",
-        "Sukhumvit Set",
-        "Superclarendon",
-        "Symbol",
-        "Tahoma",
-        "Tamil MN",
-        "Tamil Sangam MN",
-        "Telugu MN",
-        "Telugu Sangam MN",
-        "Thonburi",
-        "Times New Roman",
-        "Trattatello",
-        "Trebuchet MS",
-        "Verdana",
-        "Waseem",
-        "Webdings",
-        "Wingdings 2",
-        "Wingdings 3",
-        "Wingdings",
-        "Zapf Dingbats",
-        "Zapfino",
-    });
-#elif BUILDFLAG(IS_WIN)
-bool kCanRestrictFonts = true;
-// This list covers the fonts installed by default on Windows 11.
-// See <https://docs.microsoft.com/en-us/typography/fonts/windows_11_font_list>
-base::flat_set<base::StringPiece> kAllowedFontFamilies =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "Arial",
-        "Arial Black",
-        "Arial Bold",
-        "Arial Bold Italic",
-        "Arial Italic",
-        "Arial Nova",
-        "Arial Nova Bold",
-        "Arial Nova Bold Italic",
-        "Arial Nova Cond",
-        "Arial Nova Cond Bold",
-        "Arial Nova Cond Bold Italic",
-        "Arial Nova Cond Italic",
-        "Arial Nova Cond Light",
-        "Arial Nova Cond Light Italic",
-        "Arial Nova Italic",
-        "Arial Nova Light",
-        "Arial Nova Light Italic",
-        "Bahnschrift",
-        "Calibri",
-        "Calibri Bold",
-        "Calibri Bold Italic",
-        "Calibri Italic",
-        "Calibri Light",
-        "Calibri Light Italic",
-        "Cambria",
-        "Cambria Bold",
-        "Cambria Bold Italic",
-        "Cambria Italic",
-        "Cambria Math",
-        "Candara",
-        "Candara Bold",
-        "Candara Bold Italic",
-        "Candara Italic",
-        "Candara Light",
-        "Candara Light Italic",
-        "Comic Sans MS",
-        "Comic Sans MS Bold",
-        "Comic Sans MS Bold Italic",
-        "Comic Sans MS Italic",
-        "Consolas",
-        "Consolas Bold",
-        "Consolas Bold Italic",
-        "Consolas Italic",
-        "Constantia",
-        "Constantia Bold",
-        "Constantia Bold Italic",
-        "Constantia Italic",
-        "Corbel",
-        "Corbel Bold",
-        "Corbel Bold Italic",
-        "Corbel Italic",
-        "Corbel Light",
-        "Corbel Light Italic",
-        "Courier New",
-        "Courier New Bold",
-        "Courier New Bold Italic",
-        "Courier New Italic",
-        "Ebrima",
-        "Ebrima Bold",
-        "Franklin Gothic Medium",
-        "Franklin Gothic Medium Italic",
-        "Gabriola",
-        "Gadugi",
-        "Gadugi Bold",
-        "Georgia",
-        "Georgia Bold",
-        "Georgia Bold Italic",
-        "Georgia Italic",
-        "Georgia Pro",
-        "Georgia Pro",
-        "Georgia Pro Black",
-        "Georgia Pro Black Italic",
-        "Georgia Pro Bold",
-        "Georgia Pro Bold Italic",
-        "Georgia Pro Cond",
-        "Georgia Pro Cond Black",
-        "Georgia Pro Cond Black Italic",
-        "Georgia Pro Cond Bold",
-        "Georgia Pro Cond Bold Italic",
-        "Georgia Pro Cond Italic",
-        "Georgia Pro Cond Light",
-        "Georgia Pro Cond Light Italic",
-        "Georgia Pro Cond Semibold",
-        "Georgia Pro Cond Semibold Italic",
-        "Georgia Pro Italic",
-        "Georgia Pro Light",
-        "Georgia Pro Light Italic",
-        "Georgia Pro Semibold",
-        "Georgia Pro Semibold Italic",
-        "Gill Sans Nova",
-        "Gill Sans Nova",
-        "Gill Sans Nova Bold",
-        "Gill Sans Nova Bold Italic",
-        "Gill Sans Nova Cond",
-        "Gill Sans Nova Cond Bold",
-        "Gill Sans Nova Cond Bold Italic",
-        "Gill Sans Nova Cond Italic",
-        "Gill Sans Nova Cond Lt",
-        "Gill Sans Nova Cond Lt Italic",
-        "Gill Sans Nova Cond Ultra Bold",
-        "Gill Sans Nova Cond XBd",
-        "Gill Sans Nova Cond XBd Italic",
-        "Gill Sans Nova Italic",
-        "Gill Sans Nova Light",
-        "Gill Sans Nova Light Italic",
-        "Gill Sans Nova Ultra Bold",
-        "HoloLens MDL2 Assets",
-        "Impact",
-        "Ink Free",
-        "Javanese Text",
-        "Leelawadee UI",
-        "Leelawadee UI Bold",
-        "Leelawadee UI Semilight",
-        "Lucida Console",
-        "Lucida Sans Unicode",
-        "MS Gothic",
-        "MS PGothic",
-        "MS UI Gothic",
-        "MV Boli",
-        "Malgun Gothic",
-        "Malgun Gothic Bold",
-        "Malgun Gothic Semilight",
-        "Marlett",
-        "Microsoft Himalaya",
-        "Microsoft JhengHei",
-        "Microsoft JhengHei Bold",
-        "Microsoft JhengHei Light",
-        "Microsoft JhengHei UI",
-        "Microsoft JhengHei UI Bold",
-        "Microsoft JhengHei UI Light",
-        "Microsoft New Tai Lue",
-        "Microsoft New Tai Lue Bold",
-        "Microsoft PhagsPa",
-        "Microsoft PhagsPa Bold",
-        "Microsoft Sans Serif",
-        "Microsoft Tai Le",
-        "Microsoft Tai Le Bold",
-        "Microsoft YaHei",
-        "Microsoft YaHei Bold",
-        "Microsoft YaHei Light",
-        "Microsoft YaHei UI",
-        "Microsoft YaHei UI Bold",
-        "Microsoft YaHei UI Light",
-        "Microsoft Yi Baiti",
-        "MingLiU-ExtB",
-        "MingLiU_HKSCS-ExtB",
-        "Mongolian Baiti",
-        "Myanmar Text",
-        "Myanmar Text Bold",
-        "NSimSun",
-        "Neue Haas Grotesk Text Pro",
-        "Neue Haas Grotesk Text Pro Black",
-        "Neue Haas Grotesk Text Pro Black Italic",
-        "Neue Haas Grotesk Text Pro Bold",
-        "Neue Haas Grotesk Text Pro Bold Italic",
-        "Neue Haas Grotesk Text Pro ExtraLight",
-        "Neue Haas Grotesk Text Pro ExtraLight Italic",
-        "Neue Haas Grotesk Text Pro Light",
-        "Neue Haas Grotesk Text Pro Light Italic",
-        "Neue Haas Grotesk Text Pro Medium",
-        "Neue Haas Grotesk Text Pro Medium Italic",
-        "Neue Haas Grotesk Text Pro Regular",
-        "Neue Haas Grotesk Text Pro Regular Italic",
-        "Neue Haas Grotesk Text Pro Thin",
-        "Neue Haas Grotesk Text Pro Thin Italic",
-        "Neue Haas Grotesk Text Pro UltraThin",
-        "Neue Haas Grotesk Text Pro UltraThin Italic",
-        "Nirmala UI",
-        "Nirmala UI Bold",
-        "Nirmala UI Semilight",
-        "PMingLiU-ExtB",
-        "Palatino Linotype",
-        "Palatino Linotype Bold",
-        "Palatino Linotype Bold Italic",
-        "Palatino Linotype Italic",
-        "Rockwell Nova",
-        "Rockwell Nova Bold",
-        "Rockwell Nova Bold Italic",
-        "Rockwell Nova Cond",
-        "Rockwell Nova Cond Bold",
-        "Rockwell Nova Cond Bold Italic",
-        "Rockwell Nova Cond Italic",
-        "Rockwell Nova Cond Light",
-        "Rockwell Nova Cond Light Italic",
-        "Rockwell Nova Extra Bold",
-        "Rockwell Nova Extra Bold Italic",
-        "Rockwell Nova Italic",
-        "Rockwell Nova Light",
-        "Rockwell Nova Light Italic",
-        "Segoe Fluent Icons",
-        "Segoe MDL2 Assets",
-        "Segoe Print",
-        "Segoe Print Bold",
-        "Segoe Script",
-        "Segoe Script Bold",
-        "Segoe UI",
-        "Segoe UI",
-        "Segoe UI Black",
-        "Segoe UI Black Italic",
-        "Segoe UI Bold",
-        "Segoe UI Bold Italic",
-        "Segoe UI Emoji",
-        "Segoe UI Historic",
-        "Segoe UI Italic",
-        "Segoe UI Light",
-        "Segoe UI Light Italic",
-        "Segoe UI Semibold",
-        "Segoe UI Semibold Italic",
-        "Segoe UI Semilight",
-        "Segoe UI Semilight Italic",
-        "Segoe UI Symbol",
-        "Segoe UI Variable",
-        "Segoe UI Variable Display Bold",
-        "Segoe UI Variable Display Light",
-        "Segoe UI Variable Display Regular",
-        "Segoe UI Variable Display Semibold",
-        "Segoe UI Variable Display Semilight",
-        "Segoe UI Variable Small Bold",
-        "Segoe UI Variable Small Light",
-        "Segoe UI Variable Small Regular",
-        "Segoe UI Variable Small Semibold",
-        "Segoe UI Variable Small Semilight",
-        "Segoe UI Variable Text Bold",
-        "Segoe UI Variable Text Light",
-        "Segoe UI Variable Text Regular",
-        "Segoe UI Variable Text Semibold",
-        "Segoe UI Variable Text Semilight",
-        "SimSun",
-        "SimSun-ExtB",
-        "Sitka",
-        "Sitka Banner",
-        "Sitka Banner Bold",
-        "Sitka Banner Bold Italic",
-        "Sitka Banner Italic",
-        "Sitka Banner Semibold",
-        "Sitka Banner Semibold Italic",
-        "Sitka Display",
-        "Sitka Display Bold",
-        "Sitka Display Bold Italic",
-        "Sitka Display Italic",
-        "Sitka Display Semibold",
-        "Sitka Display Semibold Italic",
-        "Sitka Heading",
-        "Sitka Heading Bold",
-        "Sitka Heading Bold Italic",
-        "Sitka Heading Italic",
-        "Sitka Heading Semibold",
-        "Sitka Heading Semibold Italic",
-        "Sitka Small",
-        "Sitka Small Bold",
-        "Sitka Small Bold Italic",
-        "Sitka Small Italic",
-        "Sitka Small Semibold",
-        "Sitka Small Semibold Italic",
-        "Sitka Subheading",
-        "Sitka Subheading Bold",
-        "Sitka Subheading Bold Italic",
-        "Sitka Subheading Italic",
-        "Sitka Subheading Semibold",
-        "Sitka Subheading Semibold Italic",
-        "Sitka Text",
-        "Sitka Text Bold",
-        "Sitka Text Bold Italic",
-        "Sitka Text Italic",
-        "Sitka Text Semibold",
-        "Sitka Text Semibold Italic",
-        "Sylfaen",
-        "Symbol",
-        "Tahoma",
-        "Tahoma Bold",
-        "Times New Roman",
-        "Times New Roman Bold",
-        "Times New Roman Bold Italic",
-        "Times New Roman Italic",
-        "Trebuchet MS",
-        "Trebuchet MS Bold",
-        "Trebuchet MS Bold Italic",
-        "Trebuchet MS Italic",
-        "Verdana",
-        "Verdana Bold",
-        "Verdana Bold Italic",
-        "Verdana Italic",
-        "Verdana Pro",
-        "Verdana Pro",
-        "Verdana Pro Black",
-        "Verdana Pro Black Italic",
-        "Verdana Pro Bold",
-        "Verdana Pro Bold Italic",
-        "Verdana Pro Cond",
-        "Verdana Pro Cond Black",
-        "Verdana Pro Cond Black Italic",
-        "Verdana Pro Cond Bold",
-        "Verdana Pro Cond Bold Italic",
-        "Verdana Pro Cond Italic",
-        "Verdana Pro Cond Light",
-        "Verdana Pro Cond Light Italic",
-        "Verdana Pro Cond SemiBold",
-        "Verdana Pro Cond SemiBold Italic",
-        "Verdana Pro Italic",
-        "Verdana Pro Light",
-        "Verdana Pro Light Italic",
-        "Verdana Pro SemiBold",
-        "Verdana Pro SemiBold Italic",
-        "Webdings",
-        "Wingdings",
-        "Yu Gothic",
-        "Yu Gothic Bold",
-        "Yu Gothic Light",
-        "Yu Gothic Medium",
-        "Yu Gothic Regular",
-        "Yu Gothic UI Bold",
-        "Yu Gothic UI Light",
-        "Yu Gothic UI Regular",
-        "Yu Gothic UI Semibold",
-        "Yu Gothic UI Semilight"});
-#else
-bool kCanRestrictFonts = false;
-base::flat_set<base::StringPiece> kAllowedFontFamilies =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-#endif
-
-#if BUILDFLAG(IS_WIN)
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesAR =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "Aldhabi", "Andalus", "Arabic Typesetting", "Microsoft Uighur",
-        "Microsoft Uighur Bold", "Sakkal Majalla", "Sakkal Majalla Bold",
-        "Simplified Arabic", "Simplified Arabic Bold",
-        "Simplified Arabic Fixed", "Traditional Arabic",
-        "Traditional Arabic Bold", "Urdu Typesetting",
-        "Urdu Typesetting Bold"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesAS =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "Shonar Bangla", "Shonar Bangla Bold", "Vrinda", "Vrinda Bold"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesIU =
-    base::MakeFlatSet<base::StringPiece>(
-        std::vector<base::StringPiece>{"Euphemia"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesHI =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "Aparajita", "Aparajita Italic", "Aparajita Bold",
-        "Aparajita Bold Italic", "Kokila", "Kokila Italic", "Kokila Bold",
-        "Kokila Bold Italic", "Mangal", "Mangal Bold", "Sanskrit Text",
-        "Utsaah", "Utsaah Italic", "Utsaah Bold", "Utsaah Bold Italic"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesAM =
-    base::MakeFlatSet<base::StringPiece>(
-        std::vector<base::StringPiece>{"Nyala"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesGU =
-    base::MakeFlatSet<base::StringPiece>(
-        std::vector<base::StringPiece>{"Shruti", "Shruti Bold"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesPA =
-    base::MakeFlatSet<base::StringPiece>(
-        std::vector<base::StringPiece>{"Raavi", "Raavi Bold"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesZH =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "DengXian Light", "DengXian", "DengXian Bold", "FangSong", "KaiTi",
-        "SimHei", "DFKai-SB", "MingLiU", "MingLiU_HKSCS", "PMingLiU"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesHE =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "Aharoni Bold", "David", "David Bold", "FrankRuehl", "Gisha",
-        "Gisha Bold", "Levenim MT", "Levenim MT Bold", "Miriam", "Miriam Fixed",
-        "Narkisim", "Rod"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesJA =
-    base::MakeFlatSet<base::StringPiece>(
-        std::vector<base::StringPiece>{"BIZ UDGothic",
-                                       "BIZ UDGothic Bold",
-                                       "BIZ UDPGothic",
-                                       "BIZ UDPGothic Bold",
-                                       "BIZ UDMincho Medium",
-                                       "BIZ UDPMincho Medium",
-                                       "Meiryo",
-                                       "Meiryo Italic",
-                                       "Meiryo Bold",
-                                       "Meiryo Bold Italic",
-                                       "Meiryo UI",
-                                       "Meiryo UI Italic",
-                                       "Meiryo UI Bold",
-                                       "Meiryo UI Bold Italic",
-                                       "MS Mincho",
-                                       "MS PMincho",
-                                       "UD Digi Kyokasho",
-                                       "UD Digi Kyokasho N-B",
-                                       "UD Digi Kyokasho NK-B",
-                                       "UD Digi Kyokasho NK-R",
-                                       "UD Digi Kyokasho NP-B",
-                                       "UD Digi Kyokasho NP-R",
-                                       "UD Digi Kyokasho N-R",
-                                       "Yu Mincho Light",
-                                       "Yu Mincho Regular",
-                                       "Yu Mincho Demibold"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesKN =
-    base::MakeFlatSet<base::StringPiece>(
-        std::vector<base::StringPiece>{"Tunga", "Tunga Bold"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesKM =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "DaunPenh", "Khmer UI", "Khmer UI Bold", "MoolBoran"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesKO =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "Batang", "BatangChe", "Dotum", "DotumChe", "Gulim", "GulimChe",
-        "Gungsuh", "GungsuhChe"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesLO =
-    base::MakeFlatSet<base::StringPiece>(
-        std::vector<base::StringPiece>{"DokChampa", "Lao UI", "Lao UI Bold"});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesML =
-    base::MakeFlatSet<base::StringPiece>(
-        std::vector<base::StringPiece>{"Kartika", "Kartika Bold"});
-#else
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesAR =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesAS =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesIU =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesHI =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesAM =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesGU =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesPA =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesZH =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesHE =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesJA =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesKN =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesKM =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesKO =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesLO =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-base::flat_set<base::StringPiece> kAdditionalAllowedFontFamiliesML =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-#endif
-}  // namespace
-
-bool CanRestrictFontFamiliesOnThisPlatform() {
-  return kCanRestrictFonts;
-}
-
-const base::flat_set<base::StringPiece>& GetAllowedFontFamilies() {
-  return kAllowedFontFamilies;
-}
-
-const base::flat_set<base::StringPiece>&
-GetAdditionalAllowedFontFamiliesByLocale(WTF::String locale_language) {
-  if (locale_language == "ar" || locale_language == "fa" ||
-      locale_language == "ur")
-    return kAdditionalAllowedFontFamiliesAR;
-  if (locale_language == "as")
-    return kAdditionalAllowedFontFamiliesAS;
-  if (locale_language == "iu")
-    return kAdditionalAllowedFontFamiliesIU;
-  if (locale_language == "hi" || locale_language == "mr")
-    return kAdditionalAllowedFontFamiliesHI;
-  if (locale_language == "am" || locale_language == "ti")
-    return kAdditionalAllowedFontFamiliesAM;
-  if (locale_language == "gu")
-    return kAdditionalAllowedFontFamiliesGU;
-  if (locale_language == "pa")
-    return kAdditionalAllowedFontFamiliesPA;
-  if (locale_language == "zh")
-    return kAdditionalAllowedFontFamiliesZH;
-  if (locale_language == "he")
-    return kAdditionalAllowedFontFamiliesHE;
-  if (locale_language == "ja")
-    return kAdditionalAllowedFontFamiliesJA;
-  if (locale_language == "kn")
-    return kAdditionalAllowedFontFamiliesKN;
-  if (locale_language == "km")
-    return kAdditionalAllowedFontFamiliesKM;
-  if (locale_language == "ko")
-    return kAdditionalAllowedFontFamiliesKO;
-  if (locale_language == "lo")
-    return kAdditionalAllowedFontFamiliesLO;
-  if (locale_language == "ml")
-    return kAdditionalAllowedFontFamiliesML;
-  return kEmptyFontSet;
-}
-
-void set_allowed_font_families_for_testing(
-    bool can_restrict_fonts,
-    const base::flat_set<base::StringPiece>& allowed_font_families) {
-  kCanRestrictFonts = can_restrict_fonts;
-  kAllowedFontFamilies = allowed_font_families;
-}
-
-}  // namespace brave
diff --git a/third_party/blink/renderer/brave_font_whitelist.h b/third_party/blink/renderer/brave_font_whitelist.h
deleted file mode 100644
index 19988b6015c3..000000000000
--- a/third_party/blink/renderer/brave_font_whitelist.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef BRAVE_THIRD_PARTY_BLINK_RENDERER_BRAVE_FONT_WHITELIST_H_
-#define BRAVE_THIRD_PARTY_BLINK_RENDERER_BRAVE_FONT_WHITELIST_H_
-
-#include <string>
-
-#include "base/containers/flat_set.h"
-#include "base/strings/string_piece.h"
-#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
-
-namespace brave {
-
-bool CanRestrictFontFamiliesOnThisPlatform();
-const base::flat_set<base::StringPiece>& GetAllowedFontFamilies();
-
-// This takes a 2-character language code.
-const base::flat_set<base::StringPiece>&
-GetAdditionalAllowedFontFamiliesByLocale(WTF::String locale_language);
-
-void set_allowed_font_families_for_testing(
-    bool can_restrict_fonts,
-    const base::flat_set<base::StringPiece>& allowed_font_families);
-
-}  // namespace brave
-
-#endif  // BRAVE_THIRD_PARTY_BLINK_RENDERER_BRAVE_FONT_WHITELIST_H_
diff --git a/third_party/blink/renderer/brave_font_whitelist_unittest.cc b/third_party/blink/renderer/brave_font_whitelist_unittest.cc
deleted file mode 100644
index a0593542f242..000000000000
--- a/third_party/blink/renderer/brave_font_whitelist_unittest.cc
+++ /dev/null
@@ -1,152 +0,0 @@
-/* Copyright (c) 2022 The Brave Authors. All rights reserved.
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include <string>
-#include <tuple>
-#include <vector>
-
-#include "brave/third_party/blink/renderer/brave_font_whitelist.h"
-
-#include "base/containers/flat_set.h"
-#include "base/strings/string_piece.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace {
-
-base::flat_set<base::StringPiece> kTestAllowedFontFamilies =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{
-        "Roboto",
-        "Caro",
-        "Tenso",
-        "Elfo",
-    });
-base::flat_set<base::StringPiece> kEmptyFontSet =
-    base::MakeFlatSet<base::StringPiece>(std::vector<base::StringPiece>{});
-
-}  // namespace
-
-class BraveFontWhitelistTest : public testing::Test {
- public:
-  BraveFontWhitelistTest() = default;
-  BraveFontWhitelistTest(const BraveFontWhitelistTest&) = delete;
-  BraveFontWhitelistTest& operator=(const BraveFontWhitelistTest&) = delete;
-  ~BraveFontWhitelistTest() override = default;
-
-  void SetUp() override {}
-};
-
-TEST(BraveFontWhitelistTest, Platforms) {
-  base::flat_set<base::StringPiece> allowed(brave::GetAllowedFontFamilies());
-
-#if BUILDFLAG(IS_MAC)
-  EXPECT_EQ(brave::CanRestrictFontFamiliesOnThisPlatform(), true);
-  EXPECT_EQ(allowed.size(), 282UL);
-#elif BUILDFLAG(IS_WIN)
-  EXPECT_EQ(brave::CanRestrictFontFamiliesOnThisPlatform(), true);
-  EXPECT_EQ(allowed.size(), 311UL);
-#else
-  EXPECT_EQ(brave::CanRestrictFontFamiliesOnThisPlatform(), false);
-  EXPECT_EQ(allowed.size(), 0UL);
-#endif
-}
-
-TEST(BraveFontWhitelistTest, Locales) {
-  const std::array<std::tuple<WTF::String, size_t>, 20> test_cases = {
-#if BUILDFLAG(IS_WIN)
-    std::make_tuple<>("ar", 14UL),
-    std::make_tuple<>("fa", 14UL),
-    std::make_tuple<>("ur", 14UL),
-    std::make_tuple<>("iu", 1UL),
-    std::make_tuple<>("hi", 15UL),
-    std::make_tuple<>("mr", 15UL),
-    std::make_tuple<>("am", 1UL),
-    std::make_tuple<>("ti", 1UL),
-    std::make_tuple<>("gu", 2UL),
-    std::make_tuple<>("pa", 2UL),
-    std::make_tuple<>("zh", 10UL),
-    std::make_tuple<>("he", 12UL),
-    std::make_tuple<>("ja", 26UL),
-    std::make_tuple<>("kn", 2UL),
-    std::make_tuple<>("km", 4UL),
-    std::make_tuple<>("ko", 8UL),
-    std::make_tuple<>("lo", 3UL),
-    std::make_tuple<>("ml", 2UL),
-#else
-    std::make_tuple<>("ar", 0UL),
-    std::make_tuple<>("fa", 0UL),
-    std::make_tuple<>("ur", 0UL),
-    std::make_tuple<>("iu", 0UL),
-    std::make_tuple<>("hi", 0UL),
-    std::make_tuple<>("mr", 0UL),
-    std::make_tuple<>("am", 0UL),
-    std::make_tuple<>("ti", 0UL),
-    std::make_tuple<>("gu", 0UL),
-    std::make_tuple<>("pa", 0UL),
-    std::make_tuple<>("zh", 0UL),
-    std::make_tuple<>("he", 0UL),
-    std::make_tuple<>("ja", 0UL),
-    std::make_tuple<>("kn", 0UL),
-    std::make_tuple<>("km", 0UL),
-    std::make_tuple<>("ko", 0UL),
-    std::make_tuple<>("lo", 0UL),
-    std::make_tuple<>("ml", 0UL),
-#endif
-    std::make_tuple<>("en", 0UL),
-    std::make_tuple<>("la", 0UL),
-  };
-  for (const auto& c : test_cases) {
-    base::flat_set<base::StringPiece> allowed(
-        brave::GetAdditionalAllowedFontFamiliesByLocale(std::get<0>(c)));
-    EXPECT_EQ(allowed.size(), std::get<1>(c));
-  }
-}
-
-TEST(BraveFontWhitelistTest, KnownFonts) {
-  const std::array<std::tuple<base::StringPiece, bool>, 7> test_cases = {
-#if BUILDFLAG(IS_MAC)
-    std::make_tuple<>("Arial Unicode MS", true),
-    std::make_tuple<>("Calibri", false),
-    std::make_tuple<>("Gill Sans", true),
-    std::make_tuple<>("Helvetica", true),
-    std::make_tuple<>("Helvetica Neue", true),
-    std::make_tuple<>("Menlo", true),
-    std::make_tuple<>("Franklin Gothic Medium", false),
-#elif BUILDFLAG(IS_WIN)
-    std::make_tuple<>("Arial Unicode MS", false),
-    std::make_tuple<>("Calibri", true),
-    std::make_tuple<>("Gill Sans", false),
-    std::make_tuple<>("Helvetica", false),
-    std::make_tuple<>("Helvetica Neue", false),
-    std::make_tuple<>("Menlo", false),
-    std::make_tuple<>("Franklin Gothic Medium", true),
-#else
-    std::make_tuple<>("Arial Unicode MS", false),
-    std::make_tuple<>("Calibri", false),
-    std::make_tuple<>("Gill Sans", false),
-    std::make_tuple<>("Helvetica", false),
-    std::make_tuple<>("Helvetica Neue", false),
-    std::make_tuple<>("Menlo", false),
-    std::make_tuple<>("Franklin Gothic Medium", false),
-#endif
-  };
-  for (const auto& c : test_cases) {
-    EXPECT_EQ(brave::GetAllowedFontFamilies().contains(std::get<0>(c)),
-              std::get<1>(c));
-  }
-}
-
-TEST(BraveFontWhitelistTest, API) {
-  brave::set_allowed_font_families_for_testing(true /* can_restrict_fonts */,
-                                               kTestAllowedFontFamilies);
-  EXPECT_EQ(brave::CanRestrictFontFamiliesOnThisPlatform(), true);
-  base::flat_set<base::StringPiece> allowed(brave::GetAllowedFontFamilies());
-  EXPECT_EQ(allowed.size(), 4UL);
-  EXPECT_EQ(allowed.contains("Elfo"), true);
-  brave::set_allowed_font_families_for_testing(false /* can_restrict_fonts */,
-                                               kEmptyFontSet);
-  EXPECT_EQ(brave::CanRestrictFontFamiliesOnThisPlatform(), false);
-  base::flat_set<base::StringPiece> allowed2(brave::GetAllowedFontFamilies());
-  EXPECT_EQ(allowed2.size(), 0UL);
-}