diff --git a/background.js b/background.js
index 62b00bf..4f60930 100644
--- a/background.js
+++ b/background.js
@@ -4,44 +4,42 @@
  * @date 2020/11/04 17:54:49
  */
 
-chrome.runtime.onInstalled.addListener(() => {
-  chrome.action.onClicked.addListener(function (ctab) {
-    var cid = ctab.id
-    var tid = null
+chrome.action.onClicked.addListener(function (ctab) {
+  var cid = ctab.id
+  var tid = null
 
-    var callback = function () {
-      chrome.tabs.remove(tid)
-      chrome.scripting.executeScript({
-        target: { tabId: cid },
-        files: ['done.js']
-      })
+  var callback = function () {
+    chrome.tabs.remove(tid)
+    chrome.scripting.executeScript({
+      target: { tabId: cid },
+      files: ['done.js']
+    })
+  }
+
+  chrome.tabs.query({}, function (tabs) {
+    var done = false
+    for (let i = 0, tab; (tab = tabs[i++]); ) {
+      if (/^chrome:\/\/net-internals/.test(tab.url)) {
+        tid = tab.id
+        chrome.scripting.executeScript(
+          { target: { tabId: tab.id }, files: ['clean.js'] },
+          callback
+        )
+        done = true
+        break
+      }
     }
-
-    chrome.tabs.query({}, function (tabs) {
-      var done = false
-      for (let i = 0, tab; (tab = tabs[i++]); ) {
-        if (/^chrome:\/\/net-internals/.test(tab.url)) {
+    if (!done) {
+      chrome.tabs.create(
+        { url: 'chrome://net-internals/#dns', active: false },
+        function (tab) {
           tid = tab.id
           chrome.scripting.executeScript(
             { target: { tabId: tab.id }, files: ['clean.js'] },
             callback
           )
-          done = true
-          break
         }
-      }
-      if (!done) {
-        chrome.tabs.create(
-          { url: 'chrome://net-internals/#dns', active: false },
-          function (tab) {
-            tid = tab.id
-            chrome.scripting.executeScript(
-              { target: { tabId: tab.id }, files: ['clean.js'] },
-              callback
-            )
-          }
-        )
-      }
-    })
+      )
+    }
   })
 })