diff --git a/components/DangerConfirmButton.tsx b/components/DangerConfirmButton.tsx
index 81e2507..fe3a7d0 100644
--- a/components/DangerConfirmButton.tsx
+++ b/components/DangerConfirmButton.tsx
@@ -9,6 +9,7 @@ interface DangerConfirmButtonProps {
   onConfirm: () => void;
   disabled?: boolean;
   autoCancelMs?: number;
+  size?: 'normal' | 'compact';
 }
 
 export function DangerConfirmButton({
@@ -18,6 +19,7 @@ export function DangerConfirmButton({
   onConfirm,
   disabled,
   autoCancelMs = 4000,
+  size = 'normal',
 }: DangerConfirmButtonProps) {
   const t = useTranslation();
   const [armed, setArmed] = useState(false);
@@ -45,18 +47,20 @@ export function DangerConfirmButton({
     onConfirm();
   }
 
+  const armedPadding = size === 'compact' ? 'px-3 py-1.5 text-xs' : 'px-3 py-2 text-sm';
+
   if (armed) {
     return (
       <div className="flex gap-2">
         <button
           onClick={confirm}
-          className="flex-1 rounded-md cursor-pointer bg-red-600 hover:bg-red-500 text-white py-2 text-sm font-medium"
+          className={`flex-1 rounded-md cursor-pointer bg-red-600 hover:bg-red-500 text-white font-medium whitespace-nowrap ${armedPadding}`}
         >
           {confirmLabel}
         </button>
         <button
           onClick={cancel}
-          className="rounded-md cursor-pointer border border-stone-300 hover:bg-stone-100 dark:border-stone-600 dark:hover:bg-stone-700 px-3 py-2 text-sm"
+          className={`rounded-md cursor-pointer border border-stone-300 hover:bg-stone-100 dark:border-stone-600 dark:hover:bg-stone-700 whitespace-nowrap ${armedPadding}`}
         >
           {t('cancel')}
         </button>
@@ -70,6 +74,7 @@ export function DangerConfirmButton({
       onClick={arm}
       disabled={disabled}
       variant="secondary"
+      size={size}
       idleLabel={idleLabel}
     />
   );
diff --git a/components/HistoryList.tsx b/components/HistoryList.tsx
index 70480f1..3f7e652 100644
--- a/components/HistoryList.tsx
+++ b/components/HistoryList.tsx
@@ -11,6 +11,9 @@ export function HistoryList({ items, onDelete }: HistoryListProps) {
 
   return (
     <ul className="divide-y divide-stone-200 rounded-md border border-stone-200 dark:divide-stone-700 dark:border-stone-700 max-h-80 overflow-y-auto">
+      {items.length === 0 && (
+        <li className="px-3 py-4 text-sm text-stone-500 text-center">{t('noMatchingHistory')}</li>
+      )}
       {items.map((item) => (
         <li key={item.id} className="flex items-center justify-between px-3 py-2">
           <span className="text-sm truncate max-w-md">{item.title || item.url}</span>
diff --git a/components/StatusButton.tsx b/components/StatusButton.tsx
index 23874ee..bc252b0 100644
--- a/components/StatusButton.tsx
+++ b/components/StatusButton.tsx
@@ -12,6 +12,7 @@ interface StatusButtonProps {
   doneLabel?: ReactNode;
   failedLabel?: ReactNode;
   variant?: 'primary' | 'secondary';
+  size?: 'normal' | 'compact';
   className?: string;
 }
 
@@ -21,6 +22,11 @@ const VARIANT_CLASSES: Record<NonNullable<StatusButtonProps['variant']>, string>
     'border border-stone-300 hover:bg-stone-100 dark:border-stone-600 dark:hover:bg-stone-700',
 };
 
+const SIZE_CLASSES: Record<NonNullable<StatusButtonProps['size']>, string> = {
+  normal: 'w-full py-2 text-sm',
+  compact: 'px-3 py-1.5 text-xs whitespace-nowrap',
+};
+
 export function StatusButton({
   status,
   onClick,
@@ -30,6 +36,7 @@ export function StatusButton({
   doneLabel,
   failedLabel,
   variant = 'primary',
+  size = 'normal',
   className = '',
 }: StatusButtonProps) {
   const t = useTranslation();
@@ -49,7 +56,7 @@ export function StatusButton({
     <button
       onClick={onClick}
       disabled={disabled || status === 'clearing'}
-      className={`w-full rounded-md cursor-pointer disabled:cursor-not-allowed disabled:opacity-50 py-2 text-sm font-medium ${VARIANT_CLASSES[variant]} ${className}`}
+      className={`rounded-md cursor-pointer disabled:cursor-not-allowed disabled:opacity-50 font-medium ${SIZE_CLASSES[size]} ${VARIANT_CLASSES[variant]} ${className}`}
     >
       {label}
     </button>
diff --git a/components/VisitedSiteList.tsx b/components/VisitedSiteList.tsx
new file mode 100644
index 0000000..b27ff9c
--- /dev/null
+++ b/components/VisitedSiteList.tsx
@@ -0,0 +1,36 @@
+import { useTranslation } from '../hooks/useTranslation';
+import type { VisitedSite } from '../utils/clearing';
+
+interface VisitedSiteListProps {
+  sites: VisitedSite[];
+  busyHostnames: Set<string>;
+  failedHostnames: Set<string>;
+  onClear: (site: VisitedSite) => void;
+}
+
+export function VisitedSiteList({ sites, busyHostnames, failedHostnames, onClear }: VisitedSiteListProps) {
+  const t = useTranslation();
+
+  return (
+    <ul className="divide-y divide-stone-200 rounded-md border border-stone-200 dark:divide-stone-700 dark:border-stone-700 max-h-80 overflow-y-auto">
+      {sites.length === 0 && (
+        <li className="px-3 py-4 text-sm text-stone-500 text-center">{t('noMatchingSites')}</li>
+      )}
+      {sites.map((site) => {
+        const busy = busyHostnames.has(site.hostname);
+        return (
+          <li key={site.hostname} className="flex items-center justify-between px-3 py-2 gap-3">
+            <span className="text-sm truncate min-w-0">{site.hostname}</span>
+            <button
+              onClick={() => onClear(site)}
+              disabled={busy}
+              className="rounded-md border border-stone-300 hover:bg-stone-100 dark:border-stone-600 dark:hover:bg-stone-700 cursor-pointer disabled:cursor-not-allowed disabled:opacity-50 px-3 py-1 text-xs whitespace-nowrap"
+            >
+              {busy ? t('clearing') : failedHostnames.has(site.hostname) ? t('failed') : t('clear')}
+            </button>
+          </li>
+        );
+      })}
+    </ul>
+  );
+}
diff --git a/components/options/PerSiteSection.tsx b/components/options/PerSiteSection.tsx
index 7751f3d..b4986a1 100644
--- a/components/options/PerSiteSection.tsx
+++ b/components/options/PerSiteSection.tsx
@@ -2,10 +2,12 @@ import type { Browser } from 'wxt/browser';
 import { useTranslation } from '../../hooks/useTranslation';
 import { isGeckoBased } from '../../utils/browser-info';
 import type { DataTypeDef, DataTypeId } from '../../utils/data-types';
+import type { VisitedSite } from '../../utils/clearing';
 import { DataTypeGrid } from '../DataTypeGrid';
 import { OriginMappingsEditor } from '../OriginMappingsEditor';
 import { type ClearStatus } from '../StatusButton';
 import { SiteTabsSection } from './SiteTabsSection';
+import { VisitedSitesSection } from './VisitedSitesSection';
 
 interface PerSiteSectionProps {
   types: DataTypeDef[];
@@ -26,6 +28,14 @@ interface PerSiteSectionProps {
   failedTabIds: Set<number>;
   reloadingTabIds: Set<number>;
   onClearTab: (tab: Browser.tabs.Tab) => void;
+  visitedSiteFilter: string;
+  onVisitedSiteFilterChange: (value: string) => void;
+  visitedSites: VisitedSite[];
+  visitedBulkStatus: ClearStatus;
+  onClearAllVisitedSites: () => void;
+  busyVisitedHostnames: Set<string>;
+  failedVisitedHostnames: Set<string>;
+  onClearVisitedSite: (site: VisitedSite) => void;
 }
 
 export function PerSiteSection({
@@ -47,6 +57,14 @@ export function PerSiteSection({
   failedTabIds,
   reloadingTabIds,
   onClearTab,
+  visitedSiteFilter,
+  onVisitedSiteFilterChange,
+  visitedSites,
+  visitedBulkStatus,
+  onClearAllVisitedSites,
+  busyVisitedHostnames,
+  failedVisitedHostnames,
+  onClearVisitedSite,
 }: PerSiteSectionProps) {
   const t = useTranslation();
 
@@ -89,18 +107,32 @@ export function PerSiteSection({
       <hr className="border-stone-200 dark:border-stone-700 mb-3" />
 
       {!isGeckoBased() && (
-        <SiteTabsSection
-          filter={siteFilter}
-          onFilterChange={onSiteFilterChange}
-          status={bulkStatus}
-          onClearAll={onClearAllTabs}
-          tabs={tabs}
-          busyTabIds={busyTabIds}
-          failedTabIds={failedTabIds}
-          reloadingTabIds={reloadingTabIds}
-          onClearTab={onClearTab}
-        />
+        <>
+          <SiteTabsSection
+            filter={siteFilter}
+            onFilterChange={onSiteFilterChange}
+            status={bulkStatus}
+            onClearAll={onClearAllTabs}
+            tabs={tabs}
+            busyTabIds={busyTabIds}
+            failedTabIds={failedTabIds}
+            reloadingTabIds={reloadingTabIds}
+            onClearTab={onClearTab}
+          />
+          <hr className="border-stone-200 dark:border-stone-700 mb-3 mt-3" />
+        </>
       )}
+
+      <VisitedSitesSection
+        filter={visitedSiteFilter}
+        onFilterChange={onVisitedSiteFilterChange}
+        sites={visitedSites}
+        status={visitedBulkStatus}
+        onClearAll={onClearAllVisitedSites}
+        busyHostnames={busyVisitedHostnames}
+        failedHostnames={failedVisitedHostnames}
+        onClearSite={onClearVisitedSite}
+      />
     </section>
   );
 }
diff --git a/components/options/VisitedSitesSection.tsx b/components/options/VisitedSitesSection.tsx
new file mode 100644
index 0000000..d68b1ef
--- /dev/null
+++ b/components/options/VisitedSitesSection.tsx
@@ -0,0 +1,65 @@
+import { useTranslation } from '../../hooks/useTranslation';
+import type { VisitedSite } from '../../utils/clearing';
+import { DangerConfirmButton } from '../DangerConfirmButton';
+import { type ClearStatus } from '../StatusButton';
+import { VisitedSiteList } from '../VisitedSiteList';
+
+interface VisitedSitesSectionProps {
+  filter: string;
+  onFilterChange: (value: string) => void;
+  sites: VisitedSite[];
+  status: ClearStatus;
+  onClearAll: () => void;
+  busyHostnames: Set<string>;
+  failedHostnames: Set<string>;
+  onClearSite: (site: VisitedSite) => void;
+}
+
+export function VisitedSitesSection({
+  filter,
+  onFilterChange,
+  sites,
+  status,
+  onClearAll,
+  busyHostnames,
+  failedHostnames,
+  onClearSite,
+}: VisitedSitesSectionProps) {
+  const t = useTranslation();
+
+  return (
+    <div className="mt-4">
+      <h3 className="text-sm uppercase tracking-wide text-stone-500 dark:text-stone-400 mb-2">
+        {t('visitedSites')}
+      </h3>
+      <p className="text-xs text-stone-500 mb-2">{t('visitedSitesDescription')}</p>
+
+      <div className="flex gap-2 mb-2">
+        <input
+          type="text"
+          value={filter}
+          onChange={(e) => onFilterChange(e.target.value)}
+          placeholder={t('filterVisitedSitesPlaceholder')}
+          className="flex-1 rounded-md border border-stone-300 bg-stone-50 dark:border-stone-600 dark:bg-stone-800 px-3 py-1.5 text-sm placeholder:text-stone-500 focus:outline-none focus:border-blue-500"
+        />
+        <div className="shrink-0">
+          <DangerConfirmButton
+            status={status}
+            idleLabel={t('clearAllCount', { count: sites.length })}
+            confirmLabel={t('yesClearAllVisited')}
+            onConfirm={onClearAll}
+            disabled={sites.length === 0}
+            size="compact"
+          />
+        </div>
+      </div>
+
+      <VisitedSiteList
+        sites={sites}
+        busyHostnames={busyHostnames}
+        failedHostnames={failedHostnames}
+        onClear={onClearSite}
+      />
+    </div>
+  );
+}
diff --git a/entrypoints/options/App.tsx b/entrypoints/options/App.tsx
index cff1dd6..0a65063 100644
--- a/entrypoints/options/App.tsx
+++ b/entrypoints/options/App.tsx
@@ -1,11 +1,11 @@
 import { useEffect, useMemo, useState } from 'react';
 import { browser, type Browser } from 'wxt/browser';
+import { HelpPanel } from '../../components/HelpPanel';
 import { GlobalSection } from '../../components/options/GlobalSection';
+import { LanguageSection } from '../../components/options/LanguageSection';
 import { PerSiteSection } from '../../components/options/PerSiteSection';
 import { SettingsHeader, type OptionsTab } from '../../components/options/SettingsHeader';
-import { LanguageSection } from '../../components/options/LanguageSection';
 import { ThemeSection } from '../../components/options/ThemeSection';
-import { HelpPanel } from '../../components/HelpPanel';
 import { type ClearStatus } from '../../components/StatusButton';
 import { useReloadGuard } from '../../hooks/useReloadGuard';
 import { useTheme } from '../../hooks/useTheme';
@@ -17,18 +17,22 @@ import {
   clearLinkedOrigin,
   clearTab,
   clearTabData,
+  dedupeSitesByHostname,
   linkedOriginsFor,
   requestOriginPermission,
   siteScopedIds,
   tabCookieStoreId,
   tabDomain,
   tabOrigin,
+  type VisitedSite,
 } from '../../utils/clearing';
+import { mapWithConcurrency } from '../../utils/concurrency';
 import { siteScopedDataTypes } from '../../utils/data-types';
 
 type Tab = Browser.tabs.Tab;
 
 const SITE_TYPES = siteScopedDataTypes();
+const VISITED_CLEAR_CONCURRENCY = 3;
 
 export default function App() {
   useTheme();
@@ -61,6 +65,12 @@ export default function App() {
   const [historyFilter, setHistoryFilter] = useState('');
   const [historyBulkStatus, setHistoryBulkStatus] = useState<ClearStatus>('idle');
   const [globalStatus, setGlobalStatus] = useState<ClearStatus>('idle');
+  const [visitedHistory, setVisitedHistory] = useState<Browser.history.HistoryItem[]>([]);
+  const [visitedSiteFilter, setVisitedSiteFilter] = useState('');
+  const [busyVisitedHostnames, setBusyVisitedHostnames] = useState<Set<string>>(new Set());
+  const [failedVisitedHostnames, setFailedVisitedHostnames] = useState<Set<string>>(new Set());
+  const [visitedBulkStatus, setVisitedBulkStatus] = useState<ClearStatus>('idle');
+  const [clearedHostnames, setClearedHostnames] = useState<Set<string>>(new Set());
   const { reloadingTabIds, markReloading, isReloading } = useReloadGuard();
 
   useEffect(() => {
@@ -75,6 +85,10 @@ export default function App() {
     }
   }, [selectedTypesGlobal]);
 
+  useEffect(() => {
+    browser.history.search({ text: '', maxResults: 1000 }).then(setVisitedHistory);
+  }, []);
+
   const filteredTabs = useMemo(() => {
     const q = siteFilter.trim().toLowerCase();
     if (!q) return tabs;
@@ -87,6 +101,20 @@ export default function App() {
     return history.filter((item) => (item.title ?? item.url ?? '').toLowerCase().includes(q));
   }, [history, historyFilter]);
 
+  const visitedSites = useMemo(
+    () =>
+      dedupeSitesByHostname(visitedHistory.map((item) => item.url)).filter(
+        (site) => !clearedHostnames.has(site.hostname),
+      ),
+    [visitedHistory, clearedHostnames],
+  );
+
+  const filteredVisitedSites = useMemo(() => {
+    const q = visitedSiteFilter.trim().toLowerCase();
+    if (!q) return visitedSites;
+    return visitedSites.filter((site) => site.hostname.toLowerCase().includes(q));
+  }, [visitedSites, visitedSiteFilter]);
+
   async function handleGlobalClear() {
     setGlobalStatus('clearing');
     try {
@@ -192,6 +220,80 @@ export default function App() {
     setTimeout(() => setBulkStatus('idle'), 1500);
   }
 
+  async function clearVisitedSite(site: VisitedSite): Promise<boolean> {
+    const ids = siteScopedIds(selectedTypesSite);
+    await clearLinkedOrigin(site.origin, ids);
+    if (useOriginMappings) {
+      await Promise.all(
+        linkedOriginsFor(linkedOrigins, site.origin).map((target) =>
+          clearLinkedOrigin(target, ids),
+        ),
+      );
+    }
+    return true;
+  }
+
+  async function handleClearVisitedSite(site: VisitedSite) {
+    setBusyVisitedHostnames((s) => new Set(s).add(site.hostname));
+    setFailedVisitedHostnames((s) => {
+      const next = new Set(s);
+      next.delete(site.hostname);
+      return next;
+    });
+    try {
+      const granted = await requestOriginPermission();
+      if (!granted) throw new Error('permission denied');
+      await clearVisitedSite(site);
+      setClearedHostnames((s) => new Set(s).add(site.hostname));
+    } catch (err) {
+      console.error('Bleep: visited site clear failed', err);
+      setFailedVisitedHostnames((s) => new Set(s).add(site.hostname));
+    }
+    setBusyVisitedHostnames((s) => {
+      const next = new Set(s);
+      next.delete(site.hostname);
+      return next;
+    });
+  }
+
+  async function handleClearAllVisitedSites() {
+    const targets = filteredVisitedSites;
+    if (targets.length === 0) return;
+    setVisitedBulkStatus('clearing');
+    try {
+      const granted = await requestOriginPermission();
+      if (!granted) {
+        setVisitedBulkStatus('failed');
+        setTimeout(() => setVisitedBulkStatus('idle'), 1500);
+        return;
+      }
+      setBusyVisitedHostnames(new Set(targets.map((s) => s.hostname)));
+      const results = await mapWithConcurrency(targets, VISITED_CLEAR_CONCURRENCY, async (site) => {
+        try {
+          await clearVisitedSite(site);
+          return { site, ok: true };
+        } catch (err) {
+          console.error('Bleep: visited site clear failed', site.hostname, err);
+          return { site, ok: false };
+        }
+      });
+      const failed = new Set<string>();
+      const cleared = new Set<string>();
+      for (const { site, ok } of results) {
+        if (ok) cleared.add(site.hostname);
+        else failed.add(site.hostname);
+      }
+      setClearedHostnames((s) => new Set([...s, ...cleared]));
+      setFailedVisitedHostnames(failed);
+      setVisitedBulkStatus(failed.size === 0 ? 'done' : 'failed');
+    } catch (err) {
+      console.error('Bleep: clear-all-visited-sites failed', err);
+      setVisitedBulkStatus('failed');
+    }
+    setBusyVisitedHostnames(new Set());
+    setTimeout(() => setVisitedBulkStatus('idle'), 1500);
+  }
+
   async function handleDeleteHistoryItem(url: string) {
     await browser.history.deleteUrl({ url });
     setHistory((h) => h.filter((item) => item.url !== url));
@@ -202,7 +304,9 @@ export default function App() {
     setHistoryBulkStatus('clearing');
     try {
       await Promise.all(
-        filteredHistory.map((item) => (item.url ? browser.history.deleteUrl({ url: item.url }) : undefined)),
+        filteredHistory.map((item) =>
+          item.url ? browser.history.deleteUrl({ url: item.url }) : undefined,
+        ),
       );
       const removed = new Set(filteredHistory.map((item) => item.url));
       setHistory((h) => h.filter((item) => !removed.has(item.url)));
@@ -267,6 +371,14 @@ export default function App() {
             failedTabIds={failedTabIds}
             reloadingTabIds={reloadingTabIds}
             onClearTab={handleSiteClear}
+            visitedSiteFilter={visitedSiteFilter}
+            onVisitedSiteFilterChange={setVisitedSiteFilter}
+            visitedSites={filteredVisitedSites}
+            visitedBulkStatus={visitedBulkStatus}
+            onClearAllVisitedSites={handleClearAllVisitedSites}
+            busyVisitedHostnames={busyVisitedHostnames}
+            failedVisitedHostnames={failedVisitedHostnames}
+            onClearVisitedSite={handleClearVisitedSite}
           />
         )}
 
diff --git a/utils/clearing.firefox.test.ts b/utils/clearing.firefox.test.ts
new file mode 100644
index 0000000..8ebe93c
--- /dev/null
+++ b/utils/clearing.firefox.test.ts
@@ -0,0 +1,158 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { browser } from 'wxt/browser';
+import { clearLinkedOrigin, clearTabData } from './clearing';
+
+beforeEach(() => {
+  vi.stubEnv('FIREFOX', 'true');
+});
+
+afterEach(() => {
+  vi.unstubAllEnvs();
+});
+let onUpdatedListeners: Array<(tabId: number, info: { status?: string }) => void>;
+let nextTabId: number;
+let calls: string[];
+
+function stubBrowserApis() {
+  onUpdatedListeners = [];
+  nextTabId = 1;
+  calls = [];
+
+  Object.assign(browser, {
+    tabs: {
+      create: vi.fn(async (props: { url: string }) => {
+        const tab = { id: nextTabId++, url: props.url };
+        calls.push('tabs.create');
+        setTimeout(() => onUpdatedListeners.forEach((fn) => fn(tab.id, { status: 'complete' })), 0);
+        return tab;
+      }),
+      remove: vi.fn(async () => {
+        calls.push('tabs.remove');
+      }),
+      onUpdated: {
+        addListener: (fn: (tabId: number, info: { status?: string }) => void) => {
+          onUpdatedListeners.push(fn);
+        },
+        removeListener: (fn: (tabId: number, info: { status?: string }) => void) => {
+          onUpdatedListeners = onUpdatedListeners.filter((l) => l !== fn);
+        },
+      },
+    },
+    scripting: {
+      executeScript: vi.fn(async () => {
+        calls.push('scripting.executeScript');
+        return [{ result: { failed: {} } }];
+      }),
+    },
+    cookies: {
+      getAll: vi.fn(async () => {
+        calls.push('cookies.getAll');
+        return [];
+      }),
+      remove: vi.fn().mockResolvedValue(undefined),
+    },
+    browsingData: {
+      remove: vi.fn(async () => {
+        calls.push('browsingData.remove');
+      }),
+      settings: vi.fn().mockResolvedValue({ dataToRemove: {} }),
+    },
+  });
+}
+
+beforeEach(() => {
+  stubBrowserApis();
+});
+
+describe('clearLinkedOrigin (Firefox path)', () => {
+  it('clears cookies and IndexedDB natively, and cache via a background tab', async () => {
+    await clearLinkedOrigin('https://auth.domain.com', ['cache', 'cookies', 'indexedDB']);
+
+    expect(browser.tabs.create).toHaveBeenCalledWith(
+      expect.objectContaining({ url: 'https://auth.domain.com', active: false }),
+    );
+    expect(browser.scripting.executeScript).toHaveBeenCalledWith(
+      expect.objectContaining({ target: expect.objectContaining({ allFrames: true }) }),
+    );
+    expect(browser.tabs.remove).toHaveBeenCalled();
+    expect(browser.cookies.getAll).toHaveBeenCalled();
+    expect(browser.browsingData.remove).toHaveBeenCalledWith(
+      { hostnames: ['auth.domain.com'] },
+      { indexedDB: true },
+    );
+  });
+
+  it('closes the background tab before clearing cookies/IndexedDB, so a page reload cannot repopulate them after the wipe', async () => {
+    await clearLinkedOrigin('https://auth.domain.com', ['cache', 'cookies', 'indexedDB']);
+
+    const tabRemoveIndex = calls.indexOf('tabs.remove');
+    const cookiesIndex = calls.indexOf('cookies.getAll');
+    const indexedDbIndex = calls.indexOf('browsingData.remove');
+
+    expect(tabRemoveIndex).toBeGreaterThanOrEqual(0);
+    expect(tabRemoveIndex).toBeLessThan(cookiesIndex);
+    expect(tabRemoveIndex).toBeLessThan(indexedDbIndex);
+  });
+
+  it('passes the cookieStoreId (Firefox container) through to the background tab', async () => {
+    await clearLinkedOrigin('https://auth.domain.com', ['cache'], 'firefox-container-1');
+    expect(browser.tabs.create).toHaveBeenCalledWith(
+      expect.objectContaining({ cookieStoreId: 'firefox-container-1' }),
+    );
+  });
+
+  it('skips opening a tab entirely when only cookies/IndexedDB are requested', async () => {
+    await clearLinkedOrigin('https://auth.domain.com', ['cookies', 'indexedDB']);
+    expect(browser.tabs.create).not.toHaveBeenCalled();
+    expect(browser.cookies.getAll).toHaveBeenCalled();
+    expect(browser.browsingData.remove).toHaveBeenCalled();
+  });
+
+  it('still clears cookies/IndexedDB even if the background-tab step fails, then rethrows', async () => {
+    (browser.scripting.executeScript as ReturnType<typeof vi.fn>).mockRejectedValue(
+      new Error('boom'),
+    );
+
+    await expect(
+      clearLinkedOrigin('https://auth.domain.com', ['cache', 'cookies', 'indexedDB']),
+    ).rejects.toThrow('boom');
+
+    expect(browser.tabs.remove).toHaveBeenCalled();
+    expect(browser.cookies.getAll).toHaveBeenCalled();
+    expect(browser.browsingData.remove).toHaveBeenCalled();
+  });
+
+  it('does nothing when none of the requested ids are site-scoped', async () => {
+    await clearLinkedOrigin('https://auth.domain.com', ['history']);
+    expect(browser.tabs.create).not.toHaveBeenCalled();
+    expect(browser.cookies.getAll).not.toHaveBeenCalled();
+    expect(browser.browsingData.remove).not.toHaveBeenCalled();
+  });
+});
+
+describe('clearTabData (Firefox path)', () => {
+  it('clears an already-open tab via the content script, no navigation needed', async () => {
+    const ok = await clearTabData({ id: 42, url: 'https://domain.com' }, [
+      'cache',
+      'cookies',
+      'indexedDB',
+    ]);
+
+    expect(ok).toBe(true);
+    expect(browser.tabs.create).not.toHaveBeenCalled();
+    expect(browser.scripting.executeScript).toHaveBeenCalledWith(
+      expect.objectContaining({ target: { tabId: 42, allFrames: true } }),
+    );
+    expect(browser.cookies.getAll).toHaveBeenCalled();
+    expect(browser.browsingData.remove).toHaveBeenCalledWith(
+      { hostnames: ['domain.com'] },
+      { indexedDB: true },
+    );
+  });
+
+  it('returns false without touching any browser API when the tab has no url', async () => {
+    const ok = await clearTabData({ id: 42 }, ['cache']);
+    expect(ok).toBe(false);
+    expect(browser.scripting.executeScript).not.toHaveBeenCalled();
+  });
+});
diff --git a/utils/clearing.test.ts b/utils/clearing.test.ts
index f0c7de8..90a267c 100644
--- a/utils/clearing.test.ts
+++ b/utils/clearing.test.ts
@@ -1,5 +1,6 @@
 import { describe, expect, it } from 'vitest';
 import {
+  dedupeSitesByHostname,
   isValidHost,
   linkedOriginsFor,
   parseOriginMappings,
@@ -118,6 +119,31 @@ describe('linkedOriginsFor', () => {
   });
 });
 
+describe('dedupeSitesByHostname', () => {
+  it('collapses multiple visits to the same host into one entry', () => {
+    const urls = ['https://domain.com/a', 'https://domain.com/b', 'https://other.com'];
+    expect(dedupeSitesByHostname(urls)).toEqual([
+      { hostname: 'domain.com', origin: 'https://domain.com' },
+      { hostname: 'other.com', origin: 'https://other.com' },
+    ]);
+  });
+
+  it('keeps the origin of the first (most recent) occurrence', () => {
+    const urls = ['http://domain.com/first', 'https://domain.com/second'];
+    expect(dedupeSitesByHostname(urls)).toEqual([{ hostname: 'domain.com', origin: 'http://domain.com' }]);
+  });
+
+  it('skips missing and unparsable urls', () => {
+    expect(dedupeSitesByHostname([undefined, 'not a url', 'https://domain.com'])).toEqual([
+      { hostname: 'domain.com', origin: 'https://domain.com' },
+    ]);
+  });
+
+  it('returns an empty list for no input', () => {
+    expect(dedupeSitesByHostname([])).toEqual([]);
+  });
+});
+
 describe('tabOrigin / tabDomain / tabCookieStoreId', () => {
   it('extracts origin and hostname from a tab url', () => {
     const tab = { url: 'https://sub.domain.com:8443/path?x=1' };
diff --git a/utils/clearing.ts b/utils/clearing.ts
index 7426fa7..316cf49 100644
--- a/utils/clearing.ts
+++ b/utils/clearing.ts
@@ -235,10 +235,7 @@ export function parseOriginMappings(raw: string): OriginMapping[] {
       const [sourcePart, targetsPart = ''] = line.split('=>');
       return {
         source: (sourcePart ?? '').trim(),
-        targets: targetsPart
-          .split(',')
-          .map(normalizeTargetOrigin)
-          .filter(Boolean),
+        targets: targetsPart.split(',').map(normalizeTargetOrigin).filter(Boolean),
       };
     })
     .filter((m) => m.source && m.targets.length > 0);
@@ -275,15 +272,6 @@ function waitForTabComplete(tabId: number, ms: number): Promise<void> {
   );
 }
 
-/** Clears an origin with no open tab of its own — e.g. an SSO/auth domain a site
- * silently talks to (see clearCookiesForOrigin's partition note: this is exactly the
- * shape of "session survives clearing the site itself" cases). Chrome can scope
- * browsingData.remove to it directly with no tab needed. On Firefox, cookies and
- * IndexedDB go through the same native calls used for the active tab (no tab
- * required for either); the remaining storage types have no such native path, so a
- * background tab is opened briefly to run the same content-script clear, then closed.
- * ponytail: that background tab flashes in the tab strip for a moment — acceptable
- * given this only runs on an explicit clear click. */
 export async function clearLinkedOrigin(
   origin: string,
   ids: DataTypeId[],
@@ -293,34 +281,38 @@ export async function clearLinkedOrigin(
   if (scoped.length === 0) return;
 
   if (import.meta.env.FIREFOX) {
+    const scriptIds = scoped.filter((id) => id !== 'cookies' && id !== 'indexedDB');
+    let scriptError: unknown;
+    if (scriptIds.length > 0) {
+      try {
+        const tab = await browser.tabs.create({
+          url: origin,
+          active: false,
+          ...(cookieStoreId ? { cookieStoreId } : {}),
+        } as Parameters<typeof browser.tabs.create>[0]);
+        try {
+          if (tab.id != null) {
+            await waitForTabComplete(tab.id, 10000).catch(() => {});
+            await withTimeout(runContentScriptClear(tab.id, scriptIds), 15000);
+          }
+        } finally {
+          if (tab.id != null) await browser.tabs.remove(tab.id).catch(() => {});
+        }
+      } catch (err) {
+        scriptError = err;
+      }
+    }
+
     const tasks: Promise<unknown>[] = [];
     if (scoped.includes('cookies')) {
-      tasks.push(clearCookiesForOrigin(origin, cookieStoreId));
+      tasks.push(withTimeout(clearCookiesForOrigin(origin, cookieStoreId), 15000));
     }
     if (scoped.includes('indexedDB')) {
-      tasks.push(clearIndexedDBForHostname(new URL(origin).hostname));
-    }
-    const scriptIds = scoped.filter((id) => id !== 'cookies' && id !== 'indexedDB');
-    if (scriptIds.length > 0) {
-      tasks.push(
-        (async () => {
-          const tab = await browser.tabs.create({
-            url: origin,
-            active: false,
-            ...(cookieStoreId ? { cookieStoreId } : {}),
-          } as Parameters<typeof browser.tabs.create>[0]);
-          try {
-            if (tab.id != null) {
-              await waitForTabComplete(tab.id, 10000).catch(() => {});
-              await withTimeout(runContentScriptClear(tab.id, scriptIds), 15000);
-            }
-          } finally {
-            if (tab.id != null) await browser.tabs.remove(tab.id).catch(() => {});
-          }
-        })(),
-      );
+      tasks.push(withTimeout(clearIndexedDBForHostname(new URL(origin).hostname), 15000));
     }
     await Promise.all(tasks);
+
+    if (scriptError) throw scriptError;
   } else {
     await clearSiteViaBrowsingData(origin, ids);
   }
@@ -349,6 +341,25 @@ export function tabDomain(tab: { url?: string }): string | null {
   }
 }
 
+export interface VisitedSite {
+  hostname: string;
+  origin: string;
+}
+
+export function dedupeSitesByHostname(urls: Array<string | undefined>): VisitedSite[] {
+  const seen = new Map<string, string>();
+  for (const url of urls) {
+    if (!url) continue;
+    try {
+      const parsed = new URL(url);
+      if (!seen.has(parsed.hostname)) seen.set(parsed.hostname, parsed.origin);
+    } catch {
+      // not a parsable URL — skip
+    }
+  }
+  return Array.from(seen, ([hostname, origin]) => ({ hostname, origin }));
+}
+
 export async function clearTabData(
   tab: { id?: number; url?: string; cookieStoreId?: string },
   ids: DataTypeId[],
diff --git a/utils/concurrency.test.ts b/utils/concurrency.test.ts
new file mode 100644
index 0000000..ccc4d04
--- /dev/null
+++ b/utils/concurrency.test.ts
@@ -0,0 +1,43 @@
+import { describe, expect, it } from 'vitest';
+import { mapWithConcurrency } from './concurrency';
+
+describe('mapWithConcurrency', () => {
+  it('returns results in the original order regardless of completion order', async () => {
+    const items = [30, 10, 20];
+    const result = await mapWithConcurrency(items, 3, (ms) => new Promise((r) => setTimeout(() => r(ms), ms)));
+    expect(result).toEqual([30, 10, 20]);
+  });
+
+  it('never runs more than `limit` at once', async () => {
+    let active = 0;
+    let maxActive = 0;
+    const items = Array.from({ length: 10 }, (_, i) => i);
+
+    await mapWithConcurrency(items, 3, async (i) => {
+      active++;
+      maxActive = Math.max(maxActive, active);
+      await new Promise((r) => setTimeout(r, 1));
+      active--;
+      return i;
+    });
+
+    expect(maxActive).toBeLessThanOrEqual(3);
+  });
+
+  it('processes every item exactly once', async () => {
+    const seen: number[] = [];
+    await mapWithConcurrency([1, 2, 3, 4, 5], 2, async (i) => {
+      seen.push(i);
+      return i;
+    });
+    expect(seen.sort()).toEqual([1, 2, 3, 4, 5]);
+  });
+
+  it('handles an empty list', async () => {
+    expect(await mapWithConcurrency([], 5, async (i) => i)).toEqual([]);
+  });
+
+  it('handles a limit larger than the item count', async () => {
+    expect(await mapWithConcurrency([1, 2], 10, async (i) => i * 2)).toEqual([2, 4]);
+  });
+});
diff --git a/utils/concurrency.ts b/utils/concurrency.ts
new file mode 100644
index 0000000..c2f9d3b
--- /dev/null
+++ b/utils/concurrency.ts
@@ -0,0 +1,18 @@
+export async function mapWithConcurrency<T, R>(
+  items: T[],
+  limit: number,
+  fn: (item: T, index: number) => Promise<R>,
+): Promise<R[]> {
+  const results: R[] = new Array(items.length);
+  let next = 0;
+
+  async function worker() {
+    while (next < items.length) {
+      const i = next++;
+      results[i] = await fn(items[i]!, i);
+    }
+  }
+
+  await Promise.all(Array.from({ length: Math.min(limit, items.length) }, worker));
+  return results;
+}
diff --git a/utils/i18n.ts b/utils/i18n.ts
index 7b188b2..9148cbc 100644
--- a/utils/i18n.ts
+++ b/utils/i18n.ts
@@ -38,6 +38,7 @@ const en = {
   activeTabHint: 'Only the site open in this tab is affected.',
   clearAllSites: 'Clear all sites',
   yesClearEverything: 'Yes, clear everything',
+  yesClearAllVisited: 'Yes, clear these',
   allSitesHint: 'Applies to every site, not just this tab.',
   settings: 'Settings',
 
@@ -79,6 +80,12 @@ const en = {
   clearAllCount: 'Clear all ({count})',
   clear: 'Clear',
   noMatchingTabs: 'No matching tabs.',
+  noMatchingHistory: 'No history yet.',
+  visitedSites: 'Visited sites',
+  visitedSitesDescription:
+    "Any site from your history, not just open tabs — cleared the same way as the checklist above. On Firefox, this only clears the default container; a site open in a named container (e.g. Multi-Account Containers) needs clearing from its own open tab instead.",
+  filterVisitedSitesPlaceholder: 'Filter visited sites by domain…',
+  noMatchingSites: 'No matching sites.',
   recentHistory: 'Recent history',
   remove: 'Remove',
 
@@ -129,6 +136,7 @@ const ru: typeof en = {
     'Затрагивает только сайт, открытый в этой вкладке. При первом использовании запросит разрешение.',
   clearAllSites: 'Очистить все сайты',
   yesClearEverything: 'Да, очистить всё',
+  yesClearAllVisited: 'Да, очистить эти',
   allSitesHint: 'Применяется ко всем сайтам, не только к этой вкладке.',
   settings: 'Настройки',
 
@@ -170,6 +178,12 @@ const ru: typeof en = {
   clearAllCount: 'Очистить все ({count})',
   clear: 'Очистить',
   noMatchingTabs: 'Нет подходящих вкладок.',
+  noMatchingHistory: 'История пуста.',
+  visitedSites: 'Посещённые сайты',
+  visitedSitesDescription:
+    'Любой сайт из истории, а не только открытые вкладки — очищается так же, как и по чек-листу выше. В Firefox это очищает только контейнер по умолчанию; сайт, открытый в именованном контейнере (например, Multi-Account Containers), нужно очищать из его собственной открытой вкладки.',
+  filterVisitedSitesPlaceholder: 'Фильтр посещённых сайтов по домену…',
+  noMatchingSites: 'Нет подходящих сайтов.',
   recentHistory: 'Недавняя история',
   remove: 'Удалить',
 
@@ -220,6 +234,7 @@ const ro: typeof en = {
     'Afectează doar site-ul deschis în această filă. Va cere permisiune o singură dată la prima utilizare.',
   clearAllSites: 'Șterge toate site-urile',
   yesClearEverything: 'Da, șterge totul',
+  yesClearAllVisited: 'Da, șterge acestea',
   allSitesHint: 'Se aplică pentru toate site-urile, nu doar pentru această filă.',
   settings: 'Setări',
 
@@ -261,6 +276,12 @@ const ro: typeof en = {
   clearAllCount: 'Șterge toate ({count})',
   clear: 'Șterge',
   noMatchingTabs: 'Nicio filă corespunzătoare.',
+  noMatchingHistory: 'Niciun istoric încă.',
+  visitedSites: 'Site-uri vizitate',
+  visitedSitesDescription:
+    'Orice site din istoric, nu doar filele deschise — șters la fel ca lista de mai sus. Pe Firefox, se șterge doar containerul implicit; un site deschis într-un container numit (ex. Multi-Account Containers) trebuie șters din propria filă deschisă.',
+  filterVisitedSitesPlaceholder: 'Filtrează site-urile vizitate după domeniu…',
+  noMatchingSites: 'Niciun site corespunzător.',
   recentHistory: 'Istoric recent',
   remove: 'Elimină',
 
@@ -311,6 +332,7 @@ const uk: typeof en = {
     'Стосується лише сайту, відкритого в цій вкладці. При першому використанні запитає дозвіл.',
   clearAllSites: 'Очистити всі сайти',
   yesClearEverything: 'Так, очистити все',
+  yesClearAllVisited: 'Так, очистити ці',
   allSitesHint: 'Застосовується до всіх сайтів, не лише до цієї вкладки.',
   settings: 'Налаштування',
 
@@ -352,6 +374,12 @@ const uk: typeof en = {
   clearAllCount: 'Очистити всі ({count})',
   clear: 'Очистити',
   noMatchingTabs: 'Немає відповідних вкладок.',
+  noMatchingHistory: 'Історія порожня.',
+  visitedSites: 'Відвідані сайти',
+  visitedSitesDescription:
+    'Будь-який сайт з історії, а не лише відкриті вкладки — очищається так само, як за чек-листом вище. У Firefox це очищає лише контейнер за замовчуванням; сайт, відкритий у іменованому контейнері (напр. Multi-Account Containers), потрібно очищати з його власної відкритої вкладки.',
+  filterVisitedSitesPlaceholder: 'Фільтр відвіданих сайтів за доменом…',
+  noMatchingSites: 'Немає відповідних сайтів.',
   recentHistory: 'Недавня історія',
   remove: 'Видалити',