Bug 514852 - Task manager window preview can't show Firefox playing a video in real time
Summary: Task manager window preview can't show Firefox playing a video in real time
Status: NEEDSINFO WAITINGFORINFO
Alias: None
Product: plasmashell
Classification: Plasma
Component: Task Manager and Icons-Only Task Manager widgets (other bugs)
Version First Reported In: 6.5.5
Platform: CachyOS Linux
: NOR minor
Target Milestone: 1.0
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-01-20 03:53 UTC by Fernando Marcelino Muniz
Modified: 2026-01-21 22:33 UTC (History)
4 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
Issue on Plasma 6.5.5 (3.15 MB, image/jpeg)
2026-01-20 03:55 UTC, Fernando Marcelino Muniz 		Details
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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?