diff --git a/src/content/about.html b/src/content/about.html
index 626da15..10dbaab 100644
--- a/src/content/about.html
+++ b/src/content/about.html
@@ -16,6 +16,11 @@
 
     <h1 id="changelog">Changelog</h1>
     <dl>
+      <dt>8.4</dt>
+      <dd>Added light/dark theme detection for badge background color (#61)</dd>
+      <dd>Enabled to run with "controlled_by_other_extensions" on Firefox (#68)</dd>
+      <dd>Removed localhost & local network passthrough in Firefox (#50, #63, #64, #66, #71)</dd>
+      <dd>Updated Options save process to fill blank proxy header title display (#74)</dd>
 
       <dt>8.3</dt>
       <dd>Added enterprise policy & managed storage feature (#42) (experimental)</dd>
@@ -27,7 +32,6 @@ <h1 id="changelog">Changelog</h1>
       <dd>Updated PAC check to allow "file:" (#49)</dd>
       <dd>Updated user interface to disable inapplicable options in proxies</dd>
 
-
       <dt>8.2</dt>
       <dd>Added option to set the country to blank</dd>
       <dd>Fixed an issue with upgrade sync data on Chrome (#45)</dd>
diff --git a/src/content/action.js b/src/content/action.js
index 3a26f84..5a61e3d 100644
--- a/src/content/action.js
+++ b/src/content/action.js
@@ -2,11 +2,14 @@
 import {Location} from './location.js';
 
 export class Action {
+  // https://github.com/w3c/webextensions/issues/72#issuecomment-1848874359
+  // 'prefers-color-scheme' detection in Chrome background service worker
+  static dark = false;
 
   static set(pref) {
     // --- set action/browserAction
     let title = '', text = '';
-    let color = '#fff';
+    let color = this.dark ? '#444' : '#fff';
     switch (pref.mode) {
       case 'disable':
         title = browser.i18n.getMessage('disable');
diff --git a/src/content/default.css b/src/content/default.css
index 094f991..d42ea56 100644
--- a/src/content/default.css
+++ b/src/content/default.css
@@ -102,7 +102,8 @@ button:hover {
   background: var(--btn-hover);
 }
 
-button:disabled {
+button:disabled,
+select:disabled {
   cursor: not-allowed;
   opacity: 0.4;
 }
diff --git a/src/content/help.html b/src/content/help.html
index 586ce6c..bdf38bb 100644
--- a/src/content/help.html
+++ b/src/content/help.html
@@ -283,14 +283,14 @@ <h2 id="global-exclude">Global Exclude</h2>
           <th>Proxy by Patterns</th>
           <td>browser</td>
           <td><mark>FoxyProxy</mark><br><i>scheme, host, wildcard, CIDR (IPv4)</i></td>
-          <td><mark>FoxyProxy</mark></td>
+          <td><mark><s>FoxyProxy</s></mark></td>
           <td><mark>FoxyProxy</mark><br><i>scheme, host, wildcard, CIDR (IPv4)</i></td>
         </tr>
         <tr>
           <th>Single Proxy</th>
           <td>browser</td>
           <td>browser<br><i>scheme, host, wildcard, CIDR</i></td>
-          <td><mark>FoxyProxy</mark></td>
+          <td><mark><s>FoxyProxy</s></mark></td>
           <td><mark>FoxyProxy</mark><br><i>scheme, host, wildcard, CIDR (IPv4)</i></td>
         </tr>
         <tr>
@@ -304,21 +304,21 @@ <h2 id="global-exclude">Global Exclude</h2>
           <th>Incognito</th>
           <td>browser</td>
           <td>browser<br><i>scheme, host, wildcard, CIDR</i></td>
-          <td><mark>FoxyProxy</mark></td>
+          <td><mark><s>FoxyProxy</s></mark></td>
           <td><mark>FoxyProxy</mark><br><i>scheme, host, wildcard, CIDR (IPv4)</i></td>
         </tr>
         <tr>
           <th>Container</th>
           <td>n/a</td>
           <td>n/a</td>
-          <td><mark>FoxyProxy</mark></td>
+          <td><mark><s>FoxyProxy</s></mark></td>
           <td><mark>FoxyProxy</mark><br><i>scheme, host, wildcard, CIDR (IPv4)</i></td>
         </tr>
         <tr>
           <th>Tab Proxy</th>
           <td>n/a</td>
           <td>n/a</td>
-          <td><mark>FoxyProxy</mark></td>
+          <td><mark><s>FoxyProxy</s></mark></td>
           <td><mark>FoxyProxy</mark><br><i>scheme, host, wildcard, CIDR (IPv4)</i></td>
         </tr>
       </tbody>
diff --git a/src/content/on-request.js b/src/content/on-request.js
index 33ed028..0943238 100644
--- a/src/content/on-request.js
+++ b/src/content/on-request.js
@@ -139,7 +139,7 @@ export class OnRequest {
   // ---------- passthrough --------------------------------
   static bypass(url) {
     switch (true) {
-      case this.localhost(url):                             // localhost passthrough
+      // case this.localhost(url):                             // localhost passthrough
       case this.passthrough.some(i => new RegExp(i, 'i').test(url)): // global passthrough
       case this.net[0] && this.isInNet(url):                // global passthrough CIDR
         return true;
diff --git a/src/content/options.js b/src/content/options.js
index 1983a97..74acd42 100644
--- a/src/content/options.js
+++ b/src/content/options.js
@@ -249,6 +249,12 @@ class Options {
         return;
     }
 
+    // --- title check
+    if (!obj.title) {
+      const id = obj.type === 'pac' ? obj.pac : `${obj.hostname}:${obj.port}`;
+      elem.children[0].children[1].textContent = id;
+    }
+
     // --- check store locally for active PAC
     if (obj.active && obj.pac) {
       const storeLocally = elem.querySelector('.pac input[type="checkbox"]');
diff --git a/src/content/popup.html b/src/content/popup.html
index c52ee16..087d853 100644
--- a/src/content/popup.html
+++ b/src/content/popup.html
@@ -29,7 +29,7 @@ <h1 data-i18n="extensionName"><img src="../image/icon.svg" alt=""> </h1>
         <div class="host">
           <input type="text" id="filter" spellcheck="false" placeholder="filter">
 
-          <select>
+          <select class="local">
             <option value="" disabled selected>&nbsp;</option>
           </select>
 
diff --git a/src/content/popup.js b/src/content/popup.js
index 332722d..f8fd121 100644
--- a/src/content/popup.js
+++ b/src/content/popup.js
@@ -87,9 +87,12 @@ class Popup {
     if (mode === pref.mode) { return; }                     // disregard re-click
     if (pref.managed) { return; }                           // not for storage.managed
 
+    // check 'prefers-color-scheme' since it is not available in background service worker
+    const dark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+
     pref.mode = mode;
     browser.storage.local.set({mode});                      // save mode
-    browser.runtime.sendMessage({id: 'setProxy', pref});
+    browser.runtime.sendMessage({id: 'setProxy', pref, dark});
   }
 
   static processButtons(e) {
diff --git a/src/content/proxy.js b/src/content/proxy.js
index 7577244..c98458f 100644
--- a/src/content/proxy.js
+++ b/src/content/proxy.js
@@ -21,9 +21,10 @@ export class Proxy {
   }
 
   static onMessage(message) {
-    const {id, pref, host, proxy} = message;
+    const {id, pref, host, proxy, dark} = message;
     switch (id) {
       case 'setProxy':
+        Action.dark = dark;
         this.set(pref);
         break;
 
@@ -62,9 +63,9 @@ export class Proxy {
     const path = control ? `/image/icon.${ext}` : `/image/icon-off.${ext}`;
     browser.action.setIcon({path});
 
-    if (!control) {
+    if (!App.firefox && !control) {
       browser.action.setTitle({title: browser.i18n.getMessage('controlledByOtherExtensions')});
-      browser.action.setBadgeText({text: '❌'});
+      // browser.action.setBadgeText({text: '❌'});
       return null;
     }
 
@@ -131,6 +132,7 @@ export class Proxy {
         value.proxyType = 'system';
     }
 
+    // no error if levelOfControl: "controlled_by_other_extensions"
     browser.proxy.settings.set({value});
   }