User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:106.0) Gecko/20100101 Firefox/106.0

Steps to reproduce:

Tried to click near the Firefox window border to get to another background window that was just behind Firefox

Actual results:

I couldn't switch to the background window because there seams to be an invisible hitbox near the window border

Expected results:

Firefox border hitboxes should be aligned with the actual Firefox window size
Please see this StackExchange from another user here :
https://askubuntu.com/questions/1425761/22-04-unresponsive-mouse-click-boundary-outside-firefox-window-borders

Enabling the Title bar again fixes the issue as demonstrated in the video recording

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Gtk' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Hello, I have some questions:

• does it affect other Gtk apps like gedit or gnome-terminal?
• do you see that under X11 (run firefox with MOZ_ENABLE_WAYLAND=0 on terminal) ?
• do you see that if you run Firefox with MOZ_GTK_TITLEBAR_DECORATION=system MOZ_ENABLE_WAYLAND=0 env variables on terminal?

Thanks.