diff --git a/src/content/app.js b/src/content/app.js
index 3834702..5fd60c5 100644
--- a/src/content/app.js
+++ b/src/content/app.js
@@ -127,7 +127,7 @@ export class App {
     }
   }
 
-  static allowedTabUrl(url) {
+  static allowedTabProxy(url) {
     return /^https?:\/\/.+|^about:(blank|newtab)$/.test(url);
   }
 }
\ No newline at end of file
diff --git a/src/content/on-request.js b/src/content/on-request.js
index 384e32c..eef8744 100644
--- a/src/content/on-request.js
+++ b/src/content/on-request.js
@@ -226,7 +226,7 @@ export class OnRequest {
   static setTabProxy(tab, pxy) {
     // const [tab] = await browser.tabs.query({currentWindow: true, active: true});
     switch (true) {
-      case !App.allowedTabUrl(tab.url):                     // unacceptable URLs
+      case !App.allowedTabProxy(tab.url):                   // unacceptable URLs
       case this.bypass(tab.url):                            // check local & global passthrough
         return;
     }
diff --git a/src/content/popup.js b/src/content/popup.js
index cb36416..e7b03d7 100644
--- a/src/content/popup.js
+++ b/src/content/popup.js
@@ -21,7 +21,6 @@ class Popup {
     // --- Quick Add (not for storage.managed)
     this.quickAdd = document.querySelector('select#quickAdd');
     !pref.managed && this.quickAdd.addEventListener('change', () => {
-      if (!this.tab) { return; }
       if (!this.quickAdd.value) { return; }
 
       browser.runtime.sendMessage({id: 'quickAdd', pref, host: this.quickAdd.value, tab: this.tab});
@@ -54,10 +53,6 @@ class Popup {
   }
 
   static async process() {
-    const [tab] = await browser.tabs.query({currentWindow: true, active: true});
-    // set this.tab only if tab.url is acceptable
-    App.allowedTabUrl(tab.url) && (this.tab = tab);
-
     const labelTemplate = document.querySelector('template').content.firstElementChild;
     const docFrag = document.createDocumentFragment();
 
@@ -113,11 +108,15 @@ class Popup {
     this.quickAdd.appendChild(docFrag.cloneNode(true));
     this.tabProxy.appendChild(docFrag);
 
+    // get active tab
+    this.tab = (await browser.tabs.query({currentWindow: true, active: true}))[0];
+
+    // Check Tab proxy (Firefox only)
     App.firefox && this.checkTabProxy();
   }
 
   static async checkTabProxy() {
-    if (!this.tab) { return; }
+    if (!App.allowedTabProxy(this.tab.url)) { return; }     // unacceptable URLs
 
     const item = await browser.runtime.sendMessage({id: 'getTabProxy', tab: this.tab});
     item && (this.tabProxy.value = `${item.hostname}:${item.port}`);