! Remember to reload page if changed links not shown in popup.
1. Refresh page to ensure app script is loaded (might occur after first app installation)
2. Go to Extensions>Manage Extension>Keyboard Shortcuts page (chrome://extensions/shortcuts#:~:text=Change%20Tab%20Shortcut) and ensure that our app has assigned key-binding (Alt+Q/⌘+Q by default, but if it is taken by another app it needs to be configured manually)
3. Popup can`t be shown on system pages like chrome:// and so on, this is limitation of chrome browser. On these pages app will open special fallback page with Popup.
Right-Click on the extension icon: