diff --git a/src/manifest.v2.json b/src/manifest.v2.json
index abccea6..ff5e1c7 100644
--- a/src/manifest.v2.json
+++ b/src/manifest.v2.json
@@ -23,7 +23,7 @@
     ]
   },
   "browser_action": {
-    "default_popup": "popup.html"
+    "default_popup": "popup.html?popup=true"
   },
   "options_ui": {
     "page": "popup.html",
diff --git a/src/popup/Popup.jsx b/src/popup/Popup.jsx
index f13d60a..3bfcb38 100644
--- a/src/popup/Popup.jsx
+++ b/src/popup/Popup.jsx
@@ -24,7 +24,7 @@ import wechatpay from './donation/wechatpay.jpg'
 import bugmeacoffee from './donation/bugmeacoffee.png'
 import { useWindowTheme } from '../hooks/use-window-theme.mjs'
 import { languageList } from '../config/language.mjs'
-import { isFirefox, isSafari } from '../utils/index.mjs'
+import { isSafari } from '../utils/index.mjs'
 import { useTranslation } from 'react-i18next'
 
 function GeneralPart({ config, updateConfig }) {
@@ -307,9 +307,7 @@ function AdvancedPart({ config, updateConfig }) {
             updateConfig({ userSiteRegexOnly: checked })
           }}
         />
-        {`${t('Exclusively use Custom Site Regex for website matching,')}${
-          isFirefox() ? <br /> : ' '
-        }${t('ignoring built-in rules')}`}
+        {t('Exclusively use Custom Site Regex for website matching, ignoring built-in rules')}
       </label>
       <br />
       <label>
@@ -500,8 +498,11 @@ function Popup() {
     document.documentElement.dataset.theme = config.themeMode === 'auto' ? theme : config.themeMode
   }, [config.themeMode, theme])
 
+  const search = new URLSearchParams(window.location.search)
+  const popup = search.get('popup') // manifest v2
+
   return (
-    <div className="container">
+    <div className={popup === 'true' ? 'container-popup-mode' : 'container-page-mode'}>
       <form style="width:100%;">
         <Tabs selectedTabClassName="popup-tab--selected">
           <TabList>
diff --git a/src/popup/styles.scss b/src/popup/styles.scss
index 64a33e3..aef8d5f 100644
--- a/src/popup/styles.scss
+++ b/src/popup/styles.scss
@@ -23,7 +23,7 @@
   --active-color: #eaecf0;
 }
 
-.container {
+.container-page-mode {
   display: flex;
   flex-direction: column;
   align-items: center;
@@ -35,6 +35,16 @@
   overflow-y: auto;
 }
 
+.container-popup-mode {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: 440px;
+  height: 560px;
+  padding: 20px;
+  overflow-y: auto;
+}
+
 .container legend {
   font-weight: bold;
 }