diff --git a/src/GleapNotificationManager.js b/src/GleapNotificationManager.js
index 7f78a007..4ec9d82b 100644
--- a/src/GleapNotificationManager.js
+++ b/src/GleapNotificationManager.js
@@ -91,8 +91,12 @@ export default class GleapNotificationManager {
     try {
       const notificationsFromCache = loadFromGleapCache(this.unreadNotificationsKey);
       if (notificationsFromCache && notificationsFromCache.length > 0) {
+        const gleapId = GleapSession.getInstance().session?.gleapId;
         let nots = notificationsFromCache.filter(
           (notification) =>
+            // Only the contact that received it (unstamped pre-fix entries are dropped).
+            gleapId &&
+            notification?.cachedForGleapId === gleapId &&
             // Never resurface chatbar-routed notifications in the widget bubble.
             // (Pre-fix builds may have cached them before the routing guard existed.)
             notification?.data?.lastSource !== 'chatbar' &&
@@ -187,6 +191,9 @@ export default class GleapNotificationManager {
 
     const notificationsForOutbound = this.notifications.find((e) => notification.outbound === e.outbound);
     if (!notificationsForOutbound) {
+      // The cache key is shared by every contact on this browser; remember who
+      // received it so a reload never shows it to another contact.
+      notification.cachedForGleapId = GleapSession.getInstance().session?.gleapId;
       this.notifications.push(notification);
 
       // Play sound only if it's a new one and its page rules allow the
@@ -645,10 +652,9 @@ export default class GleapNotificationManager {
    * @param {boolean} fromOtherTab - True when applying a clear broadcast from a sibling tab (prevents re-broadcast loops).
    */
   clearAllNotifications(uiOnly = false, fromOtherTab = false) {
-    if (!this.notificationContainer) {
-      return;
-    }
-
+    // Clear the state and cache even before the UI is mounted: a clearIdentity()
+    // queued in the snippet runs before injectNotificationUI(), which would
+    // otherwise replay the previous contact's notifications from the cache.
     if (!uiOnly) {
       this.notifications = [];
       // Reset currentNewsIndex whenever we clear them out
@@ -656,6 +662,10 @@ export default class GleapNotificationManager {
       saveToGleapCache(this.unreadNotificationsKey, this.notifications);
     }
 
+    if (!this.notificationContainer) {
+      return;
+    }
+
     while (this.notificationContainer.firstChild) {
       this.notificationContainer.removeChild(this.notificationContainer.firstChild);
     }
diff --git a/src/GleapNotificationManager.test.js b/src/GleapNotificationManager.test.js
index c50f95dd..37afd7f4 100644
--- a/src/GleapNotificationManager.test.js
+++ b/src/GleapNotificationManager.test.js
@@ -253,7 +253,7 @@ describe('page rules — render-time evaluation (#141052)', () => {
   test('cached page-ruled notifications survive a reload on an excluded page but stay hidden', () => {
     setUrl(EXCLUDED_URL);
     const nm = withContainer(GleapNotificationManager.getInstance());
-    const cached = pageRuledNotification();
+    const cached = { ...pageRuledNotification(), cachedForGleapId: 'user-1' };
     loadFromGleapCache.mockReturnValue([cached]);
 
     nm.reloadNotificationsFromCache();
@@ -319,7 +319,9 @@ describe('notification stack', () => {
   test('reloadNotificationsFromCache keeps the NEWEST 4 (the same end shift() trims from)', () => {
     const nm = withContainer(GleapNotificationManager.getInstance());
     jest.spyOn(nm, 'renderNotifications').mockImplementation(() => {});
-    loadFromGleapCache.mockReturnValue([1, 2, 3, 4, 5, 6].map((i) => plainNotification(`n${i}`)));
+    loadFromGleapCache.mockReturnValue(
+      [1, 2, 3, 4, 5, 6].map((i) => ({ ...plainNotification(`n${i}`), cachedForGleapId: 'user-1' }))
+    );
 
     nm.reloadNotificationsFromCache();
 
@@ -365,9 +367,71 @@ describe('clearAllNotifications — cross-tab broadcast gate', () => {
     expect(sendMessageMock).not.toHaveBeenCalled();
   });
 
-  test('no notification container => early return, no broadcast', () => {
+  test('no notification container => no broadcast (the tab channel only starts with the UI)', () => {
     const nm = GleapNotificationManager.getInstance();
     nm.clearAllNotifications();
     expect(sendMessageMock).not.toHaveBeenCalled();
   });
 });
+
+describe('notification cache vs identity (#225880)', () => {
+  const plainNotification = (text, gleapId) => ({
+    outbound: `outbound-${text}`,
+    createdAt: new Date().toISOString(),
+    data: { text },
+    ...(gleapId ? { cachedForGleapId: gleapId } : {}),
+  });
+
+  beforeEach(() => {
+    loadFromGleapCache.mockReset();
+    saveToGleapCache.mockReset();
+  });
+
+  test('clearAllNotifications(false) clears the persisted cache before the UI is mounted', () => {
+    // A clearIdentity() queued in the snippet runs before injectNotificationUI().
+    const nm = GleapNotificationManager.getInstance();
+    nm.notifications = [plainNotification('previous user')];
+
+    nm.clearAllNotifications(false);
+
+    expect(nm.notifications).toEqual([]);
+    expect(saveToGleapCache).toHaveBeenCalledWith(nm.unreadNotificationsKey, []);
+  });
+
+  test('a UI-only clear before mount leaves the cache alone', () => {
+    const nm = GleapNotificationManager.getInstance();
+    const notification = plainNotification('keep');
+    nm.notifications = [notification];
+
+    nm.clearAllNotifications(true);
+
+    expect(nm.notifications).toEqual([notification]);
+    expect(saveToGleapCache).not.toHaveBeenCalled();
+  });
+
+  test('showNotification stamps the receiving gleapId on the cached notification', () => {
+    const nm = withContainer(GleapNotificationManager.getInstance());
+    jest.spyOn(nm, 'renderNotifications').mockImplementation(() => {});
+
+    nm.showNotification(plainNotification('hello'));
+
+    expect(saveToGleapCache).toHaveBeenCalledWith(nm.unreadNotificationsKey, [
+      expect.objectContaining({ cachedForGleapId: 'user-1' }),
+    ]);
+  });
+
+  test('reloadNotificationsFromCache drops notifications cached for another (or no) gleapId', () => {
+    const nm = withContainer(GleapNotificationManager.getInstance());
+    jest.spyOn(nm, 'renderNotifications').mockImplementation(() => {});
+    const own = plainNotification('own', 'user-1');
+    loadFromGleapCache.mockReturnValue([
+      plainNotification('previous user', 'user-0'),
+      plainNotification('unstamped'),
+      own,
+    ]);
+
+    nm.reloadNotificationsFromCache();
+
+    expect(nm.notifications).toEqual([own]);
+  });
+});