diff --git a/src/background/main.js b/src/background/main.js
index 986aedb..74c09dd 100644
--- a/src/background/main.js
+++ b/src/background/main.js
@@ -712,13 +712,7 @@ async function openContentView(message, view) {
     return;
   }
 
-  const [isContentModule] = await executeScript({
-    func: () => typeof initContent !== 'undefined',
-    code: `typeof initContent !== 'undefined'`,
-    tabId
-  });
-
-  if (!isContentModule) {
+  if (!(await hasModule({tabId, module: 'content'}))) {
     await executeScript({files: ['/src/content/script.js'], tabId});
   }
 
@@ -1043,7 +1037,7 @@ async function execEngine(tabId, engine, taskId) {
   await executeScript({
     func: taskId => (self.taskId = taskId),
     args: [taskId],
-    code: `var taskId = '${taskId}';`,
+    code: `self.taskId = '${taskId}'`,
     tabId
   });
   await executeScript({files: ['/src/commons-engine/script.js'], tabId});
@@ -1051,12 +1045,12 @@ async function execEngine(tabId, engine, taskId) {
 }
 
 async function searchClickTarget(session) {
-  const [isParseModule] = await executeScript({
-    func: () => typeof initParse !== 'undefined',
-    code: `typeof initParse !== 'undefined'`,
+  const isParseModule = await hasModule({
     tabId: session.sourceTabId,
-    frameIds: [session.sourceFrameId]
+    frameId: session.sourceFrameId,
+    module: 'parse'
   });
+
   if (!isParseModule) {
     await executeScript({
       files: ['/src/parse/script.js'],
diff --git a/src/base/main.js b/src/base/main.js
index 1a81b2b..afb39a9 100644
--- a/src/base/main.js
+++ b/src/base/main.js
@@ -1,14 +1,8 @@
 import storage from 'storage/storage';
 import {isIncomingShareContext, processIncomingShare} from 'utils/app';
+import {runOnce} from 'utils/common';
 
 function main() {
-  // Script may be injected multiple times.
-  if (self.baseModule) {
-    return;
-  } else {
-    self.baseModule = true;
-  }
-
   self.touchTarget = {
     node: null,
     dx: 0,
@@ -156,4 +150,6 @@ function main() {
   }
 }
 
-main();
+if (runOnce('baseModule')) {
+  main();
+}
diff --git a/src/content/main.js b/src/content/main.js
index cbd0133..cbaeab5 100644
--- a/src/content/main.js
+++ b/src/content/main.js
@@ -5,10 +5,10 @@ import {
   getAppTheme,
   addThemeListener
 } from 'utils/app';
-import {addCssClass} from 'utils/common';
+import {addCssClass, runOnce} from 'utils/common';
 import {targetEnv} from 'utils/config';
 
-var contentStorage = {
+const contentStorage = {
   viewFrame: null,
   viewFrameId: 0,
   viewMessagePort: null,
@@ -163,13 +163,15 @@ async function configTheme(viewFrame) {
   await setTheme();
 }
 
-self.initContent = function () {
+function main() {
   addViewFrame();
 
   browser.runtime.onMessage.addListener(onMessage);
   if (targetEnv !== 'firefox') {
     browser.runtime.onConnect.addListener(onConnect);
   }
-};
+}
 
-initContent();
+if (runOnce('contentModule')) {
+  main();
+}
diff --git a/src/engines/123rf.js b/src/engines/123rf.js
index c70954a..baddc10 100644
--- a/src/engines/123rf.js
+++ b/src/engines/123rf.js
@@ -1,4 +1,5 @@
 import {validateUrl} from 'utils/app';
+import {runOnce} from 'utils/common';
 import {initSearch, prepareImageForUpload, sendReceipt} from 'utils/engines';
 
 const engine = '123rf';
@@ -45,4 +46,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/adobestock.js b/src/engines/adobestock.js
index 6deb9d8..1e04dc4 100644
--- a/src/engines/adobestock.js
+++ b/src/engines/adobestock.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'adobestock';
@@ -20,4 +20,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/alamy.js b/src/engines/alamy.js
index 261822d..1ac94e5 100644
--- a/src/engines/alamy.js
+++ b/src/engines/alamy.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'alamy';
@@ -20,4 +20,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/alibabaChina.js b/src/engines/alibabaChina.js
index dc9123f..d5071ba 100644
--- a/src/engines/alibabaChina.js
+++ b/src/engines/alibabaChina.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'alibabaChina';
@@ -28,4 +28,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/ascii2d.js b/src/engines/ascii2d.js
index 4bd120d..8bf6c11 100644
--- a/src/engines/ascii2d.js
+++ b/src/engines/ascii2d.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'ascii2d';
@@ -18,4 +18,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/auDesign.js b/src/engines/auDesign.js
index f4e93f3..ac4fce3 100644
--- a/src/engines/auDesign.js
+++ b/src/engines/auDesign.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'auDesign';
@@ -27,4 +27,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/auTrademark.js b/src/engines/auTrademark.js
index 9a4354e..650277b 100644
--- a/src/engines/auTrademark.js
+++ b/src/engines/auTrademark.js
@@ -1,4 +1,4 @@
-import {findNode, processNode} from 'utils/common';
+import {findNode, processNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'auTrademark';
@@ -40,4 +40,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/baidu.js b/src/engines/baidu.js
index 10cb1f0..78ebd9c 100644
--- a/src/engines/baidu.js
+++ b/src/engines/baidu.js
@@ -1,5 +1,5 @@
 import {validateUrl} from 'utils/app';
-import {findNode, isMobile} from 'utils/common';
+import {findNode, isMobile, runOnce} from 'utils/common';
 import {
   initSearch,
   prepareImageForUpload,
@@ -76,4 +76,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/bing.js b/src/engines/bing.js
index cd15606..83fe588 100644
--- a/src/engines/bing.js
+++ b/src/engines/bing.js
@@ -1,4 +1,4 @@
-import {findNode, isMobile} from 'utils/common';
+import {findNode, isMobile, runOnce} from 'utils/common';
 import {
   initSearch,
   prepareImageForUpload,
@@ -59,4 +59,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/branddb.js b/src/engines/branddb.js
index 34f58aa..5199213 100644
--- a/src/engines/branddb.js
+++ b/src/engines/branddb.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'branddb';
@@ -33,4 +33,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/clipretrieval.js b/src/engines/clipretrieval.js
index cb68ca8..f052068 100644
--- a/src/engines/clipretrieval.js
+++ b/src/engines/clipretrieval.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'clipretrieval';
@@ -20,4 +20,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/depositphotos.js b/src/engines/depositphotos.js
index abc0062..fea15c1 100644
--- a/src/engines/depositphotos.js
+++ b/src/engines/depositphotos.js
@@ -1,4 +1,4 @@
-import {findNode, makeDocumentVisible} from 'utils/common';
+import {findNode, makeDocumentVisible, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'depositphotos';
@@ -28,4 +28,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/dreamstime.js b/src/engines/dreamstime.js
index 85041af..bef610e 100644
--- a/src/engines/dreamstime.js
+++ b/src/engines/dreamstime.js
@@ -2,7 +2,8 @@ import {
   findNode,
   processNode,
   isMobile,
-  executeScriptMainContext
+  executeScriptMainContext,
+  runOnce
 } from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 import {targetEnv} from 'utils/config';
@@ -39,4 +40,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/enterpix.js b/src/engines/enterpix.js
index 6218bbb..3200f07 100644
--- a/src/engines/enterpix.js
+++ b/src/engines/enterpix.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'enterpix';
@@ -24,4 +24,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/esearch.js b/src/engines/esearch.js
index 7ca0a12..cc204fa 100644
--- a/src/engines/esearch.js
+++ b/src/engines/esearch.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'esearch';
@@ -22,4 +22,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/freepik.js b/src/engines/freepik.js
index 2785a08..0256cf9 100644
--- a/src/engines/freepik.js
+++ b/src/engines/freepik.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'freepik';
@@ -20,4 +20,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/getty.js b/src/engines/getty.js
index 73ec96a..cbf0694 100644
--- a/src/engines/getty.js
+++ b/src/engines/getty.js
@@ -1,4 +1,4 @@
-import {findNode, sleep} from 'utils/common';
+import {findNode, runOnce, sleep} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'getty';
@@ -29,4 +29,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/google.js b/src/engines/google.js
index b13e0f9..39cb45f 100644
--- a/src/engines/google.js
+++ b/src/engines/google.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'google';
@@ -35,4 +35,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/googleLens.js b/src/engines/googleLens.js
index 9d32de5..c1d1634 100644
--- a/src/engines/googleLens.js
+++ b/src/engines/googleLens.js
@@ -1,4 +1,4 @@
-import {findNode, processNode, sleep} from 'utils/common';
+import {findNode, processNode, runOnce, sleep} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'googleLens';
@@ -62,4 +62,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/haveibeentrained.js b/src/engines/haveibeentrained.js
index efd7768..2cf1984 100644
--- a/src/engines/haveibeentrained.js
+++ b/src/engines/haveibeentrained.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'haveibeentrained';
@@ -18,4 +18,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/icons8.js b/src/engines/icons8.js
index 7282ac2..573e4fa 100644
--- a/src/engines/icons8.js
+++ b/src/engines/icons8.js
@@ -1,4 +1,4 @@
-import {findNode, makeDocumentVisible} from 'utils/common';
+import {findNode, makeDocumentVisible, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'icons8';
@@ -21,4 +21,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/ikea.js b/src/engines/ikea.js
index 5dbfe87..3242379 100644
--- a/src/engines/ikea.js
+++ b/src/engines/ikea.js
@@ -1,4 +1,9 @@
-import {findNode, processNode, makeDocumentVisible} from 'utils/common';
+import {
+  findNode,
+  processNode,
+  makeDocumentVisible,
+  runOnce
+} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'ikea';
@@ -26,4 +31,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/immerse.js b/src/engines/immerse.js
index d4fadda..3ee7d8f 100644
--- a/src/engines/immerse.js
+++ b/src/engines/immerse.js
@@ -1,4 +1,4 @@
-import {findNode, makeDocumentVisible, sleep} from 'utils/common';
+import {findNode, makeDocumentVisible, runOnce, sleep} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'immerse';
@@ -23,4 +23,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/iqdb.js b/src/engines/iqdb.js
index 89abc73..ae8f1ce 100644
--- a/src/engines/iqdb.js
+++ b/src/engines/iqdb.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'iqdb';
@@ -18,4 +18,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/istock.js b/src/engines/istock.js
index 2316a75..80e2a3f 100644
--- a/src/engines/istock.js
+++ b/src/engines/istock.js
@@ -1,4 +1,4 @@
-import {findNode, sleep} from 'utils/common';
+import {findNode, runOnce, sleep} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'istock';
@@ -29,4 +29,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/jpDesign.js b/src/engines/jpDesign.js
index 68fae97..3673339 100644
--- a/src/engines/jpDesign.js
+++ b/src/engines/jpDesign.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'jpDesign';
@@ -26,4 +26,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/kagi.js b/src/engines/kagi.js
index 3cf0d2f..d61535d 100644
--- a/src/engines/kagi.js
+++ b/src/engines/kagi.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {initSearch, setFileInputData, sendReceipt} from 'utils/engines';
 
 const engine = 'kagi';
@@ -47,4 +47,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/karmaDecay.js b/src/engines/karmaDecay.js
index a23cb1f..12fccbc 100644
--- a/src/engines/karmaDecay.js
+++ b/src/engines/karmaDecay.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'karmaDecay';
@@ -24,4 +24,6 @@ function init() {
   }
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/lexica.js b/src/engines/lexica.js
index 5053039..bed9e7d 100644
--- a/src/engines/lexica.js
+++ b/src/engines/lexica.js
@@ -1,4 +1,4 @@
-import {findNode, executeScriptMainContext} from 'utils/common';
+import {findNode, executeScriptMainContext, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'lexica';
@@ -22,4 +22,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/lykdat.js b/src/engines/lykdat.js
index daa3ade..14a9b1c 100644
--- a/src/engines/lykdat.js
+++ b/src/engines/lykdat.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'lykdat';
@@ -20,4 +20,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/madridMonitor.js b/src/engines/madridMonitor.js
index deb13c2..0236380 100644
--- a/src/engines/madridMonitor.js
+++ b/src/engines/madridMonitor.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 import {targetEnv} from 'utils/config';
 
@@ -41,4 +41,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/nzTrademark.js b/src/engines/nzTrademark.js
index 225dcee..fdb2315 100644
--- a/src/engines/nzTrademark.js
+++ b/src/engines/nzTrademark.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'nzTrademark';
@@ -38,4 +38,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/pimeyes.js b/src/engines/pimeyes.js
index bef1a88..bfb330d 100644
--- a/src/engines/pimeyes.js
+++ b/src/engines/pimeyes.js
@@ -1,4 +1,4 @@
-import {findNode, processNode} from 'utils/common';
+import {findNode, processNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'pimeyes';
@@ -55,4 +55,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/pixta.js b/src/engines/pixta.js
index 96dafc8..06e8b1d 100644
--- a/src/engines/pixta.js
+++ b/src/engines/pixta.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'pixta';
@@ -34,4 +34,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/pond5.js b/src/engines/pond5.js
index 4718ea0..7b2d22d 100644
--- a/src/engines/pond5.js
+++ b/src/engines/pond5.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'pond5';
@@ -22,4 +22,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/qihoo.js b/src/engines/qihoo.js
index aa9e555..f0478f7 100644
--- a/src/engines/qihoo.js
+++ b/src/engines/qihoo.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'qihoo';
@@ -27,4 +27,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/repostSleuth.js b/src/engines/repostSleuth.js
index 5677006..34e9611 100644
--- a/src/engines/repostSleuth.js
+++ b/src/engines/repostSleuth.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'repostSleuth';
@@ -37,4 +37,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/saucenao.js b/src/engines/saucenao.js
index 3aeeeae..8e62060 100644
--- a/src/engines/saucenao.js
+++ b/src/engines/saucenao.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'saucenao';
@@ -34,4 +34,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/shein.js b/src/engines/shein.js
index cac63af..11d5b98 100644
--- a/src/engines/shein.js
+++ b/src/engines/shein.js
@@ -1,4 +1,9 @@
-import {findNode, processNode, makeDocumentVisible} from 'utils/common';
+import {
+  findNode,
+  processNode,
+  makeDocumentVisible,
+  runOnce
+} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'shein';
@@ -30,4 +35,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/shutterstock.js b/src/engines/shutterstock.js
index 77ef635..33ebfda 100644
--- a/src/engines/shutterstock.js
+++ b/src/engines/shutterstock.js
@@ -1,4 +1,4 @@
-import {findNode, isMobile} from 'utils/common';
+import {findNode, isMobile, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'shutterstock';
@@ -29,4 +29,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/sogou.js b/src/engines/sogou.js
index d72f6fc..3480fd9 100644
--- a/src/engines/sogou.js
+++ b/src/engines/sogou.js
@@ -1,4 +1,4 @@
-import {findNode, isMobile} from 'utils/common';
+import {findNode, isMobile, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'sogou';
@@ -22,4 +22,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/stocksy.js b/src/engines/stocksy.js
index 6b104b1..76dab65 100644
--- a/src/engines/stocksy.js
+++ b/src/engines/stocksy.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'stocksy';
@@ -20,4 +20,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/taobao.js b/src/engines/taobao.js
index 6d4d41a..7bb477d 100644
--- a/src/engines/taobao.js
+++ b/src/engines/taobao.js
@@ -1,4 +1,4 @@
-import {findNode, executeScriptMainContext} from 'utils/common';
+import {findNode, executeScriptMainContext, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'taobao';
@@ -27,4 +27,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/tineye.js b/src/engines/tineye.js
index dc73d9e..c945d43 100644
--- a/src/engines/tineye.js
+++ b/src/engines/tineye.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'tineye';
@@ -18,4 +18,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/tmview.js b/src/engines/tmview.js
index 9e96a6a..a894469 100644
--- a/src/engines/tmview.js
+++ b/src/engines/tmview.js
@@ -1,4 +1,4 @@
-import {findNode, processNode} from 'utils/common';
+import {findNode, processNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'tmview';
@@ -35,4 +35,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/whatanime.js b/src/engines/whatanime.js
index f549273..8df9aa3 100644
--- a/src/engines/whatanime.js
+++ b/src/engines/whatanime.js
@@ -1,4 +1,4 @@
-import {findNode} from 'utils/common';
+import {findNode, runOnce} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'whatanime';
@@ -18,4 +18,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/wildberries.js b/src/engines/wildberries.js
index f513255..2ed8233 100644
--- a/src/engines/wildberries.js
+++ b/src/engines/wildberries.js
@@ -1,4 +1,4 @@
-import {findNode, sleep} from 'utils/common';
+import {findNode, runOnce, sleep} from 'utils/common';
 import {setFileInputData, initSearch, sendReceipt} from 'utils/engines';
 
 const engine = 'wildberries';
@@ -21,4 +21,6 @@ function init() {
   initSearch(search, engine, taskId);
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/engines/yandex.js b/src/engines/yandex.js
index f142375..14aeff5 100644
--- a/src/engines/yandex.js
+++ b/src/engines/yandex.js
@@ -4,7 +4,8 @@ import {validateUrl, getContentXHR} from 'utils/app';
 import {
   findNode,
   makeDocumentVisible,
-  executeScriptMainContext
+  executeScriptMainContext,
+  runOnce
 } from 'utils/common';
 import {
   initSearch,
@@ -171,4 +172,6 @@ function init() {
   }
 }
 
-init();
+if (runOnce('search')) {
+  init();
+}
diff --git a/src/parse/main.js b/src/parse/main.js
index 4718547..c7181df 100644
--- a/src/parse/main.js
+++ b/src/parse/main.js
@@ -22,7 +22,8 @@ import {
   getBlankCanvasDataUrl,
   canvasToDataUrl,
   drawElementOnCanvas,
-  getAbsoluteUrl
+  getAbsoluteUrl,
+  runOnce
 } from 'utils/common';
 import {targetEnv} from 'utils/config';
 
@@ -365,7 +366,7 @@ async function parseDocument({root = null, touchRect = null, session} = {}) {
 }
 
 async function parse(session) {
-  if (typeof baseModule === 'undefined') {
+  if (!self.runStore?.baseModule) {
     throw new Error('Base module missing');
   }
 
@@ -408,7 +409,7 @@ async function parse(session) {
   return processResults(results, session);
 }
 
-self.initParse = async function (session) {
+async function initParse(session) {
   try {
     const images = await parse(session);
 
@@ -442,7 +443,7 @@ self.initParse = async function (session) {
 
     throw err;
   }
-};
+}
 
 function onMessage(request, sender) {
   // Samsung Internet 13: extension messages are sometimes also dispatched
@@ -456,4 +457,10 @@ function onMessage(request, sender) {
   }
 }
 
-browser.runtime.onMessage.addListener(onMessage);
+function main() {
+  browser.runtime.onMessage.addListener(onMessage);
+}
+
+if (runOnce('parseModule')) {
+  main();
+}
diff --git a/src/utils/app.js b/src/utils/app.js
index f7234a4..0c48404 100755
--- a/src/utils/app.js
+++ b/src/utils/app.js
@@ -255,9 +255,9 @@ function getListItems(data, {scope = '', shortScope = ''} = {}) {
 async function hasModule({tabId, frameId = 0, module, insert = false} = {}) {
   try {
     const [isModule] = await executeScript({
-      func: name => typeof self[`${name}Module`] !== 'undefined',
+      func: module => self.runStore?.[`${module}Module`],
       args: [module],
-      code: `typeof ${module}Module !== 'undefined'`,
+      code: `self.runStore?.['${module}Module']`,
       tabId,
       frameIds: [frameId]
     });
@@ -273,7 +273,9 @@ async function hasModule({tabId, frameId = 0, module, insert = false} = {}) {
     if (isModule || insert) {
       return true;
     }
-  } catch (err) {}
+  } catch (err) {
+    console.log(err);
+  }
 
   return false;
 }
diff --git a/src/utils/common.js b/src/utils/common.js
index da2fa10..922da94 100644
--- a/src/utils/common.js
+++ b/src/utils/common.js
@@ -531,13 +531,6 @@ function waitForDocumentLoad() {
 }
 
 function makeDocumentVisible() {
-  // Script may be injected multiple times.
-  if (self.documentVisibleModule) {
-    return;
-  } else {
-    self.documentVisibleModule = true;
-  }
-
   const eventName = uuidv4();
 
   function dispatchVisibilityState() {
@@ -803,11 +796,21 @@ function filenameToFileExt(name) {
   return (/(?:\.([^.]+))?$/.exec(name)[1] || '').toLowerCase();
 }
 
-function runOnce(name, func) {
-  name = `${name}Run`;
+function getStore(name, {content = null} = {}) {
+  name = `${name}Store`;
 
   if (!self[name]) {
-    self[name] = true;
+    self[name] = content || {};
+  }
+
+  return self[name];
+}
+
+function runOnce(name, func) {
+  const store = getStore('run');
+
+  if (!store[name]) {
+    store[name] = true;
 
     if (!func) {
       return true;
@@ -868,6 +871,7 @@ export {
   getAbsoluteUrl,
   getDataFromUrl,
   filenameToFileExt,
+  getStore,
   runOnce,
   sleep
 };
diff --git a/src/utils/engines.js b/src/utils/engines.js
index dd8daaf..a379636 100644
--- a/src/utils/engines.js
+++ b/src/utils/engines.js
@@ -98,16 +98,9 @@ async function sendReceipt(storageIds) {
 }
 
 async function initSearch(searchFn, engine, taskId) {
-  // Script may be injected multiple times.
-  if (typeof self.task === 'undefined') {
-    self.task = null;
-  } else {
-    return;
-  }
-
   await waitForDocumentLoad();
 
-  self.task = await browser.runtime.sendMessage({
+  const task = await browser.runtime.sendMessage({
     id: 'storageRequest',
     asyncResponse: true,
     storageId: taskId