diff --git a/CHANGELOG.md b/CHANGELOG.md
index b862db3b..96256d47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@
 
 ### Fixed
 
+- `:ws_url` option is now used without modifications WYSIWYG.
+
 ### Removed
 
 
diff --git a/README.md b/README.md
index 350df06e..9af47332 100644
--- a/README.md
+++ b/README.md
@@ -188,7 +188,7 @@ Ferrum::Browser.new(options)
   * `:url` (String) - URL for a running instance of Chrome. If this is set, a
       browser process will not be spawned.
   * `:ws_url` (String) - Websocket url for a running instance of Chrome. If this is set, a
-      browser process will not be spawned.
+    browser process will not be spawned. It's higher priority than `:url`, setting both doesn't make sense.
   * `:process_timeout` (Integer) - How long to wait for the Chrome process to
       respond on startup.
   * `:ws_max_receive_size` (Integer) - How big messages to accept from Chrome
diff --git a/lib/ferrum/browser/process.rb b/lib/ferrum/browser/process.rb
index 006f975a..163cccfe 100644
--- a/lib/ferrum/browser/process.rb
+++ b/lib/ferrum/browser/process.rb
@@ -62,15 +62,11 @@ def self.directory_remover(path)
       def initialize(options)
         @pid = @xvfb = @user_data_dir = nil
 
-        if options.ws_url
-          response = parse_json_version(options.ws_url)
-          self.ws_url = response&.[]("webSocketDebuggerUrl") || options.ws_url
-          return
-        end
-
-        if options.url
-          response = parse_json_version(options.url)
-          self.ws_url = response&.[]("webSocketDebuggerUrl")
+        if options.ws_url || options.url
+          # `:ws_url` option is higher priority than `:url`, parse versions
+          # and use it as a ws_url, otherwise use what has been parsed.
+          response = parse_json_version(options.ws_url || options.url)
+          self.ws_url = options.ws_url || response&.[]("webSocketDebuggerUrl")
           return
         end
 
@@ -207,7 +203,7 @@ def parse_json_version(url)
         @protocol_version = response["Protocol-Version"]
 
         response
-      rescue StandardError
+      rescue JSON::ParserError
         # nop
       end
     end
diff --git a/spec/browser_spec.rb b/spec/browser_spec.rb
index da3b1f88..6856f5c3 100644
--- a/spec/browser_spec.rb
+++ b/spec/browser_spec.rb
@@ -135,8 +135,7 @@
 
     it "supports :ws_url argument" do
       with_external_browser do |url, process|
-        uri = Addressable::URI.parse(url)
-        browser = Ferrum::Browser.new(ws_url: "ws://#{uri.host}:#{uri.port}")
+        browser = Ferrum::Browser.new(ws_url: web_socket_debugger_url(url))
         expect(process.v8_version).not_to be_nil
         expect(process.browser_version).not_to be_nil
         expect(process.webkit_version).not_to be_nil
diff --git a/spec/support/global_helpers.rb b/spec/support/global_helpers.rb
index 59266934..08f3853d 100644
--- a/spec/support/global_helpers.rb
+++ b/spec/support/global_helpers.rb
@@ -58,4 +58,12 @@ def with_external_browser(host: "127.0.0.1", port: 32_001)
       process.stop
     end
   end
+
+  def web_socket_debugger_url(url)
+    uri = Addressable::URI.parse(url)
+    url = uri.join("/json/version").to_s
+    JSON.parse(Net::HTTP.get(URI(url)))["webSocketDebuggerUrl"]
+  rescue JSON::ParserError
+    # nop
+  end
 end
diff --git a/spec/unit/process_spec.rb b/spec/unit/process_spec.rb
index 519a2ee7..5ad6c435 100644
--- a/spec/unit/process_spec.rb
+++ b/spec/unit/process_spec.rb
@@ -10,6 +10,7 @@
       allow(Ferrum::Client).to receive(:new).and_return(double.as_null_object)
 
       allow_any_instance_of(Ferrum::Browser::Process).to receive(:parse_ws_url)
+      allow_any_instance_of(Ferrum::Browser::Process).to receive(:parse_json_version)
 
       subject.send(:start)
 
@@ -30,6 +31,7 @@
       allow(Process).to receive(:spawn).with({ "LD_PRELOAD" => "some.so" }, any_args).and_return(123_456_789)
 
       allow_any_instance_of(Ferrum::Browser::Process).to receive(:parse_ws_url)
+      allow_any_instance_of(Ferrum::Browser::Process).to receive(:parse_json_version)
 
       subject.send(:start)
       subject.quit