Bug 514852

Summary:	Task manager window preview can't show Firefox playing a video in real time
Product:	[Plasma] plasmashell	Reporter:	Fernando Marcelino Muniz <fernandommuniz>
Component:	Task Manager and Icons-Only Task Manager widgets	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	NEEDSINFO WAITINGFORINFO
Severity:	minor	CC:	kde, kde, kdedev, qydwhotmail
Priority:	NOR
Version First Reported In:	6.5.5
Target Milestone:	1.0
Platform:	CachyOS
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Issue on Plasma 6.5.5

Description Fernando Marcelino Muniz 2026-01-20 03:53:53 UTC

STEPS TO REPRODUCE
1. Play a YouTube video on Firefox.
2. Take a peek at the window preview.

OBSERVED RESULT
Only the thumbnail of the video is shown.

EXPECTED RESULT
It should show what is happening; the video being played.

SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux 
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
Kernel Version: 6.18.6-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 8 × 11th Gen Intel® Core™ i5-11300H @ 3.10GHz
Memory: 9 GB of RAM (8.1 GB usable)
Graphics Processor 1: Intel® Iris® Xe Graphics
Graphics Processor 2: NVIDIA GeForce GTX 1650
Manufacturer: LENOVO
Product Name: 82MG
System Version: IdeaPad Gaming 3 15IHU6

ADDITIONAL INFORMATION
Oddly enough it only happens with certain videos it seems.

Comment 1 Fernando Marcelino Muniz 2026-01-20 03:55:44 UTC

Created attachment 188702 [details]
Issue on Plasma 6.5.5

Comment 2 TraceyC 2026-01-21 22:33:22 UTC

I'm able to reproduce this on Plasma 6.5.5. 
https://www.youtube.com/shorts/rz2ZUKZMRxE

I can't test with git-master right now because Firefox won't show any previews on the task bar icon at all.

Can you provide a link to a video where the bug happens, and one for a video where the preview works as expected?