windows.onFocusChanged problems

[Liang Cui]

ENV:
- windows11 

- chrome version  143.0.7499.193 (previous versions also have these problems.)

- also happens with Edge.

link of document: chrome.windows.onFocusChanged.

Issue 1: windows.onFocusChanged not fired when switching focus between Chrome and other apps

• Steps:

  1. Focus a Chrome window

  2. click Notepad (or any non-Chrome app)

  3. click back to Chrome

• Expected:

  • Event fires with windowId = chrome.windows.WINDOW_ID_NONE (-1) when Chrome loses focus

  • Event fires with the focused Chrome windowId when Chrome regains focus

• Actual:

  • No windows.onFocusChanged event fired in both directions (Chrome → Notepad, Notepad → Chrome)

Issue 2: wrong windowId when switching between different Chrome profiles

• Setup: multiple Chrome profiles (main profile with google account logged in , and one temp profile  B), each has its own Chrome window.

• Steps:

  1. Focus Main Profile   window

  2. Switch focus to Profile B window

• Expected (in Main Profile  extension context):

  • windows.onFocusChanged fires with windowId = -1 (Main Profile  has no focused Chrome window)

• Actual (only in packed/store-installed):

  • Event fires but windowId equals Profile B’s windowId, not -1

• Control:

  • If the same extension is loaded as unpacked, Profile A receives windowId = -1 as expected.

  • Switching focus from Profile B → Profile A: event parameters are correct in both profiles.