User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0

Steps to reproduce:

Open firefox in configuration that opens more than one window but one of them must fully cover another (previously both in fullscreen)

Actual results:

Top window is visually frozen, you can move it in couple of seconds after startup which unfroze it but after that it become unresponsive. You still can unfroze it if you use hotkey for window change which in gnome have preview.

Expected results:

At least top window should start to load last page

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.

Which desktop/distro do you use?

(In reply to Martin Stránský [:stransky] (ni? me) from comment #2)

Which desktop/distro do you use?

It was Manjaro with KDE but i switched to Gnome by changing packages. In both situations it was\is unstable branch.

Thanks. Please attach about:support page. Also please try to create screencast of the issue:
https://fedoraproject.org/wiki/How_to_debug_Firefox_problems#Collect_information_for_a_bug_report
Thanks.

https://youtu.be/GHVsCqgJJZY Screencast

https://pastebin.com/dAuCQVXd about:support

I see, Thanks. Can you try to get backtrace/crash ID from the frozen Firefox instance? How-to is here:
https://fedoraproject.org/wiki/Debugging_guidelines_for_Mozilla_products#Getting_Mozilla_crash_report_from_running_application
Thanks.

(In reply to Martin Stránský [:stransky] (ni? me) from comment #6)

I see, Thanks. Can you try to get backtrace/crash ID from the frozen Firefox instance? How-to is here:
https://fedoraproject.org/wiki/Debugging_guidelines_for_Mozilla_products#Getting_Mozilla_crash_report_from_running_application
Thanks.

Submitted Crash ID
bp-4cd603fa-0766-4107-bd24-10e7c0220604

I also noticed that pages that have autostart like youtube, just starts to play, but only audio, but i can still control playback by clicking in place where video screen should be or by using arrows

In addition i would add about some derivations from clean install because i can't tell if that is visible from what i already reported or if that could be problem.

In pursuit of hardware acceleration i've made some additions

In /etc/environment
LIBVA_DRIVER_NAME=nvidia
EGL_PLATFORM=wayland
MOZ_ENABLE_WAYLAND=1
MOZ_X11_EGL=1

And an additional package from AUR containing
https://github.com/elFarto/nvidia-vaapi-driver

Trying to gather more info i deleted that package, commented out those environment variables and reverted to default preferences about webrender and vaapi. Bug still occurs.

Also i found another way in which bug occurs. I can just open additional window to one opened and new window "render" is frozen.
Actually if i get out from bug by manipulating already opened windows, every new window that will be opened, still will be frozen. And like that to infinity.