diff --git a/app/scripts/lib/notification-manager.js b/app/scripts/lib/notification-manager.js
index 2e4d45ee2..225d2f3c5 100644
--- a/app/scripts/lib/notification-manager.js
+++ b/app/scripts/lib/notification-manager.js
@@ -51,7 +51,12 @@ export default class NotificationManager extends EventEmitter {
         const lastFocused = await this.platform.getLastFocusedWindow();
         // Position window in top right corner of lastFocused window.
         top = lastFocused.top;
-        left = lastFocused.left + (lastFocused.width - NOTIFICATION_WIDTH);
+        // - this is to make sure no error is triggered from polyfill
+        // error eg: Invalid value for bounds. Bounds must be at least 50% within visible screen space.
+        left = Math.max(
+          lastFocused.left + (lastFocused.width - NOTIFICATION_WIDTH),
+          0,
+        );
       } catch (_) {
         // The following properties are more than likely 0, due to being
         // opened from the background chrome process for the extension that
diff --git a/app/scripts/lib/notification-manager.test.ts b/app/scripts/lib/notification-manager.test.ts
index b3c44b249..bdbffbdaa 100644
--- a/app/scripts/lib/notification-manager.test.ts
+++ b/app/scripts/lib/notification-manager.test.ts
@@ -35,6 +35,7 @@ jest.mock('webextension-polyfill', () => {
       getAll: jest.fn(),
       create: jest.fn(),
       update: jest.fn(),
+      getLastFocused: jest.fn(),
     },
   };
 });
@@ -68,4 +69,28 @@ describe('Notification Manager', () => {
     expect(setCurrentPopupIdSpy).toHaveBeenCalledTimes(1);
     expect(setCurrentPopupIdSpy).toHaveBeenCalledWith(newPopupWindow.id);
   });
+
+  it('should not pass negative left value for extension window created from last focused window', async () => {
+    const newPopupWindow = generateMockWindow();
+    setCurrentPopupIdSpy = jest.fn();
+    const createSpy = jest.fn().mockReturnValue(newPopupWindow);
+    browser.windows.getAll.mockReturnValue([]);
+    browser.windows.create = createSpy;
+    browser.windows.getLastFocused.mockReturnValue({
+      top: 0,
+      left: 0,
+      width: 120, // make sure this is smalled than NOTIFICATION_WIDTH
+    });
+    currentPopupId = undefined;
+    await notificationManager.showPopup(setCurrentPopupIdSpy, currentPopupId);
+    expect(createSpy).toHaveBeenCalledTimes(1);
+    expect(createSpy).toHaveBeenCalledWith({
+      height: 620,
+      left: 0, // this is critical, means error related to polyfill is not triggered
+      top: 0,
+      type: 'popup',
+      url: 'notification.html',
+      width: 360,
+    });
+  });
 });