diff --git a/src/background/common.js b/src/background/common.js
index 60f2683a2a..068519c1f6 100644
--- a/src/background/common.js
+++ b/src/background/common.js
@@ -24,9 +24,14 @@ export const dataHub = {
 };
 const data = {__proto__: null};
 
+/** @type {Set<(isDark: boolean) => ?>} */
 export const onSchemeChange = new Set();
+/** @type {Set<(tabId: number, url: string, oldUrl?: string) => ?>} */
+export const onTabUrlChange = new Set();
+/** @type {Set<(tabId: number, frameId: number, port: chrome.runtime.Port) => ?>} */
 export const onUnload = new Set();
-export const onUrl = new Set();
+/** @type {Set<(data: Object, type: 'committed'|'history'|'hash') => ?>} */
+export const onUrlChange = new Set();
 
 export const uuidIndex = Object.assign(new Map(), {
   custom: {},
diff --git a/src/background/icon-manager.js b/src/background/icon-manager.js
index fc6953d7ab..dc16b38fdb 100644
--- a/src/background/icon-manager.js
+++ b/src/background/icon-manager.js
@@ -1,4 +1,4 @@
-import {kDisableAll, kStyleIds, kUrl} from '@/js/consts';
+import {kDisableAll, kStyleIds} from '@/js/consts';
 import {__values as __prefs, subscribe} from '@/js/prefs';
 import {CHROME, FIREFOX, MOBILE, VIVALDI} from '@/js/ua';
 import {debounce, t} from '@/js/util';
@@ -70,11 +70,10 @@ onUnload.add((tabId, frameId, port) => {
  */
 export function updateIconBadge(styleIds, lazyBadge) {
   // FIXME: in some cases, we only have to redraw the badge. is it worth a optimization?
-  const {tab: {id: tabId}, TDM, url} = this.sender;
+  const {tab: {id: tabId}, TDM} = this.sender;
   const frameId = TDM > 0 ? 0 : this.sender.frameId;
   const value = styleIds.length ? styleIds.map(Number) : undefined;
   tabMan.set(tabId, kStyleIds, frameId, value);
-  tabMan.set(tabId, kUrl, frameId, value && url);
   debounce(refreshStaleBadges, frameId && lazyBadge ? 250 : 0);
   staleBadges.add(tabId);
   if (!frameId) refreshIcon(tabId, true);
diff --git a/src/background/navigation-manager.js b/src/background/navigation-manager.js
index 0843d707a8..875a656989 100644
--- a/src/background/navigation-manager.js
+++ b/src/background/navigation-manager.js
@@ -5,11 +5,9 @@ import {chromeProtectsNTP} from '@/js/urls';
 import {deepEqual} from '@/js/util';
 import {ignoreChromeError, MF} from '@/js/util-webext';
 import {pingTab, sendTab} from './broadcast';
-import {bgBusy} from './common';
+import {bgBusy, onUrlChange} from './common';
 import tabCache from './tab-manager';
 
-/** @type {Set<(data: Object, type: 'committed'|'history'|'hash') => ?>} */
-export const onUrlChange = new Set();
 export const webNavigation = chrome.webNavigation;
 /** @type {{ url: chrome.events.UrlFilter[] }} */
 const WEBNAV_FILTER_STYLABLE = {
diff --git a/src/background/tab-manager.js b/src/background/tab-manager.js
index dc5a953ea4..bb0850d4c3 100644
--- a/src/background/tab-manager.js
+++ b/src/background/tab-manager.js
@@ -2,9 +2,9 @@ import {kApplyPort, kStyleIds, kUrl} from '@/js/consts';
 import {onDisconnect} from '@/js/msg';
 import {supported} from '@/js/urls';
 import {ignoreChromeError} from '@/js/util-webext';
-import {bgBusy, bgInit, onUnload, onUrl} from './common';
+import {bgBusy, bgInit, onUnload, onTabUrlChange, onUrlChange} from './common';
 import {stateDB} from './db';
-import {kCommitted, onUrlChange} from './navigation-manager';
+import {kCommitted} from './navigation-manager';
 
 /** @typedef {{ url:string, styleIds: {[frameId:string]: number[]} }} StyleIdsFrameMap */
 /** @type {Map<number,{ id: number, nonce:Object, url:Object, styleIds: StyleIdsFrameMap }>} */
@@ -109,9 +109,9 @@ bgBusy.then(() => {
       obj[kUrl] = {0: url};
     else
       (obj[kUrl] ??= {})[frameId] = url;
-    if (frameId) return;
     if (__.MV3) stateDB.put(obj, tabId);
-    for (const fn of onUrl) fn(tabId, url, oldUrl);
+    if (frameId) return;
+    for (const fn of onTabUrlChange) fn(tabId, url, oldUrl);
   });
 });
 
diff --git a/src/background/usercss-install-helper.js b/src/background/usercss-install-helper.js
index 887e4045f4..2482763776 100644
--- a/src/background/usercss-install-helper.js
+++ b/src/background/usercss-install-helper.js
@@ -5,7 +5,7 @@ import * as prefs from '@/js/prefs';
 import {FIREFOX} from '@/js/ua';
 import * as URLS from '@/js/urls';
 import {getHost, RX_META} from '@/js/util';
-import {bgBusy, onUrl} from './common';
+import {bgBusy, onTabUrlChange} from './common';
 import download from './download';
 import tabCache, * as tabMan from './tab-manager';
 import {openURL} from './tab-util';
@@ -27,8 +27,8 @@ export function getInstallCode(url) {
 }
 
 function toggle(key, val, isInit) {
-  if (val) onUrl.add(maybeInstall);
-  else onUrl.delete(maybeInstall);
+  if (val) onTabUrlChange.add(maybeInstall);
+  else onTabUrlChange.delete(maybeInstall);
   if (!__.MV3 || !isInit) toggleUrlInstaller(val);
 }