No longer working for me following latest extension (4.2.3) and FF update (137.0.1). Click the button, does nothing.

As of version 2.2.7, this works perfectly in Windows. Note that it requires you to allow it to run in private windows. When I first tried it, I didn't have that enabled. So instead of opening a private window, it opened its Settings page to let me set the permission.

useful！