diff --git a/extension/content.js b/extension/content.js
index 2f7835e..67d3674 100644
--- a/extension/content.js
+++ b/extension/content.js
@@ -1017,11 +1017,14 @@ const aiCredentialCache = {
   pending: null
 };
 const AI_SETTINGS_CACHE_TTL = 30 * 1000;
+const AI_SETTINGS_SYNC_KEY = 'fb_tracker_ai_settings_sync';
 const aiSettingsCache = {
   data: null,
   timestamp: 0,
   pending: null
 };
+const aiAvailabilitySubscribers = new Set();
+let aiSettingsBroadcastChannel = null;
 const MODERATION_SETTINGS_CACHE_TTL = 5 * 60 * 1000;
 const moderationSettingsCache = {
   data: null,
@@ -1141,6 +1144,97 @@ function backendFetch(url, options = {}) {
   return fetch(url, config);
 }
 
+function notifyAIAvailabilitySubscribers() {
+  aiAvailabilitySubscribers.forEach((subscriber) => {
+    try {
+      subscriber(aiSettingsCache.data || null);
+    } catch (error) {
+      console.warn('[FB Tracker] Failed to notify AI availability subscriber:', error);
+    }
+  });
+}
+
+function ensureAISettingsBroadcastChannel() {
+  if (aiSettingsBroadcastChannel || typeof BroadcastChannel !== 'function') {
+    return aiSettingsBroadcastChannel;
+  }
+
+  try {
+    aiSettingsBroadcastChannel = new BroadcastChannel('fb-tracker-ai-settings');
+    aiSettingsBroadcastChannel.addEventListener('message', (event) => {
+      const data = event && event.data ? event.data : null;
+      if (!data || !data.settings) {
+        return;
+      }
+      if (data.timestamp && data.timestamp <= aiSettingsCache.timestamp) {
+        return;
+      }
+      applyAISettingsSnapshot(data.settings, { timestamp: data.timestamp || Date.now(), broadcast: false });
+    });
+  } catch (error) {
+    console.warn('[FB Tracker] Failed to initialize AI settings BroadcastChannel:', error);
+    aiSettingsBroadcastChannel = null;
+  }
+
+  return aiSettingsBroadcastChannel;
+}
+
+function applyAISettingsSnapshot(settings, options = {}) {
+  if (!settings || typeof settings !== 'object') {
+    return;
+  }
+
+  const { timestamp = Date.now(), broadcast = false } = options;
+  aiSettingsCache.data = settings;
+  aiSettingsCache.timestamp = timestamp;
+  notifyAIAvailabilitySubscribers();
+
+  if (!broadcast) {
+    return;
+  }
+
+  const payload = JSON.stringify({
+    timestamp,
+    settings
+  });
+
+  try {
+    localStorage.setItem(AI_SETTINGS_SYNC_KEY, payload);
+  } catch (error) {
+    console.warn('[FB Tracker] Failed to sync AI settings via localStorage:', error);
+  }
+
+  try {
+    ensureAISettingsBroadcastChannel()?.postMessage({ timestamp, settings });
+  } catch (error) {
+    console.warn('[FB Tracker] Failed to sync AI settings via BroadcastChannel:', error);
+  }
+}
+
+window.addEventListener('storage', (event) => {
+  if (!event || event.key !== AI_SETTINGS_SYNC_KEY || !event.newValue) {
+    return;
+  }
+
+  try {
+    const payload = JSON.parse(event.newValue);
+    if (!payload || !payload.settings) {
+      return;
+    }
+    if (payload.timestamp && payload.timestamp <= aiSettingsCache.timestamp) {
+      return;
+    }
+    applyAISettingsSnapshot(payload.settings, {
+      timestamp: payload.timestamp || Date.now(),
+      broadcast: false
+    });
+  } catch (error) {
+    console.warn('[FB Tracker] Failed to process synced AI settings:', error);
+  }
+});
+
+ensureAISettingsBroadcastChannel();
+
 async function fetchActiveAICredentials(forceRefresh = false) {
   const now = Date.now();
   if (!forceRefresh && aiCredentialCache.data && (now - aiCredentialCache.timestamp < AI_CREDENTIAL_CACHE_TTL)) {
@@ -1205,8 +1299,7 @@ async function fetchAISettings(forceRefresh = false) {
     }
 
     const settings = await response.json();
-    aiSettingsCache.data = settings;
-    aiSettingsCache.timestamp = Date.now();
+    applyAISettingsSnapshot(settings, { timestamp: Date.now(), broadcast: forceRefresh });
     return settings;
   })();
 
@@ -1226,6 +1319,26 @@ function getAIAutoCommentRateLimitStatusFromSettings(settings, profileNumber) {
   return statuses.find((entry) => parseInt(entry?.profile_number, 10) === normalizedProfile) || null;
 }
 
+function upsertAIAutoCommentRateLimitStatus(settings, status) {
+  if (!status || typeof status !== 'object') {
+    return settings;
+  }
+
+  const existing = settings && typeof settings === 'object'
+    ? settings
+    : { enabled: 1, rate_limit_statuses: [] };
+  const currentStatuses = Array.isArray(existing.rate_limit_statuses) ? existing.rate_limit_statuses : [];
+  const normalizedProfile = parseInt(status.profile_number, 10);
+  const nextStatuses = currentStatuses.filter((entry) => parseInt(entry?.profile_number, 10) !== normalizedProfile);
+  nextStatuses.push(status);
+  nextStatuses.sort((left, right) => (parseInt(left?.profile_number, 10) || 0) - (parseInt(right?.profile_number, 10) || 0));
+
+  return {
+    ...existing,
+    rate_limit_statuses: nextStatuses
+  };
+}
+
 function formatAIAutoCommentRateLimitReason(status) {
   if (!status || !status.blocked_reason) {
     return 'Aktion aktuell gesperrt';
@@ -6807,6 +6920,27 @@ async function addAICommentButton(container, postElement) {
     return await rateLimitRefreshPromise;
   };
 
+  const handleSharedAISettingsUpdate = async (settings) => {
+    if (!wrapper.isConnected) {
+      aiAvailabilitySubscribers.delete(handleSharedAISettingsUpdate);
+      return;
+    }
+
+    try {
+      const profileNumber = await fetchBackendProfileNumber();
+      if (!profileNumber) {
+        applyAvailabilityState(null);
+        return;
+      }
+      const status = getAIAutoCommentRateLimitStatusFromSettings(settings, profileNumber);
+      applyAvailabilityState(status);
+    } catch (error) {
+      console.warn('[FB Tracker] Failed to apply shared AI settings update:', error);
+    }
+  };
+
+  aiAvailabilitySubscribers.add(handleSharedAISettingsUpdate);
+
   const updateNoteIndicator = () => {
     const note = getAdditionalNote();
     const hasNote = note.trim().length > 0;
@@ -7577,9 +7711,11 @@ async function addAICommentButton(container, postElement) {
       });
       mergeTraceInfo(aiResult);
       if (aiResult.autoCommentRateLimitStatus) {
+        const nextSettings = upsertAIAutoCommentRateLimitStatus(aiSettingsCache.data, aiResult.autoCommentRateLimitStatus);
+        applyAISettingsSnapshot(nextSettings, { timestamp: Date.now(), broadcast: true });
         applyAvailabilityState(aiResult.autoCommentRateLimitStatus);
       } else {
-        void refreshAvailabilityState(true);
+        void refreshAvailabilityState(true, profileNumber);
       }
 
       throwIfCancelled();
@@ -7694,7 +7830,11 @@ async function addAICommentButton(container, postElement) {
       }
 
       if (error && error.status === 429) {
-        await refreshAvailabilityState(true);
+        const syncedStatus = await refreshAvailabilityState(true);
+        if (syncedStatus) {
+          const nextSettings = upsertAIAutoCommentRateLimitStatus(aiSettingsCache.data, syncedStatus);
+          applyAISettingsSnapshot(nextSettings, { timestamp: Date.now(), broadcast: true });
+        }
       }
 
       const cancelled = aiContext.cancelled || isCancellationError(error);