Bug 514639 - Firefox PIP window freezes when resizing
Summary: Firefox PIP window freezes when resizing
Status: NEEDSINFO WAITINGFORINFO
Alias: None
Product: kwin
Classification: Plasma
Component: xwayland (other bugs)
Version First Reported In: 6.4.5
Platform: Other Other
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-01-15 10:01 UTC by Paragoumba
Modified: 2026-01-15 20:01 UTC (History)
0 users

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Description Paragoumba 2026-01-15 10:01:12 UTC 
SUMMARY
The PiP window freezes when resizing it

STEPS TO REPRODUCE
1. Start firefox with xwayland
2. Go to any website with a video player
3. Pop up the video, with the PiP button on the right of the player
4. Try to resize the PiP window with one of the corners

OBSERVED RESULT
The window freezes for a few seconds and doesn't resize

EXPECTED RESULT
The resize should be smooth while the video is playing 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 43
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION
I can reproduce this bug on ArchLinux, Fedora 43 and Alma 10 with Plasma 6.4.5 running Firefox on XWayland. It might also happen on Wayland without the new PiP protocol
It doesn't happen on Alma 9 with Plasma 5.27
I am pretty sure it is a KDE bug rather than a Firefox one as I couldn't reproduce on Gnome and it also happens with Firefox ESR
Comment 1 Vlad Zahorodnii 2026-01-15 13:50:34 UTC 
Does it happen in 6.5?
Comment 2 Paragoumba 2026-01-15 19:49:04 UTC 
(In reply to Vlad Zahorodnii from comment #1)
> Does it happen in 6.5?

It does happen on 6.5.5 with XWayland
Comment 3 Paragoumba 2026-01-15 20:01:51 UTC 
And on 6.5.90