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Browser video "freezes" in transparent background when Terminal maximized #23758

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opened 2026-01-31 08:51:43 +00:00 by claunia · 3 comments
claunia commented 2026-01-31 08:51:43 +00:00
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Originally created by @nc7s on GitHub (Oct 26, 2025).

Windows Terminal version

1.23.12811.0

Windows build number

10.0.19045.0

Other Software

Firefox 145.0
Chromium 141.0.7390.108

Steps to reproduce

  1. Play a video in the browser
  2. Switch to Terminal and maximize, so the browser is under it
  3. Play a local video with a local player like VLC
  4. Switch to Terminal and maximize, so the player is under it

Expected Behavior

Both videos should continue playing.

Actual Behavior

The video in browser "freezes" (in Firefox the frame stays, in Chromium the player goes black) under Terminal, while the video in local player plays normally.

Originally created by @nc7s on GitHub (Oct 26, 2025). ### Windows Terminal version 1.23.12811.0 ### Windows build number 10.0.19045.0 ### Other Software Firefox 145.0 Chromium 141.0.7390.108 ### Steps to reproduce 1. Play a video in the browser 2. Switch to Terminal and maximize, so the browser is under it 3. Play a local video with a local player like VLC 4. Switch to Terminal and maximize, so the player is under it ### Expected Behavior Both videos should continue playing. ### Actual Behavior The video in browser "freezes" (in Firefox the frame stays, in Chromium the player goes black) under Terminal, while the video in local player plays normally.
claunia added the Resolution-By-DesignNeeds-Tag-Fix labels 2026-01-31 08:51:43 +00:00
claunia commented 2026-01-31 08:51:45 +00:00
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@Aditya-maharshi commented on GitHub (Oct 26, 2025):

The most likely culprit is the interaction between browser hardware acceleration and the acrylic transparency effect.

Disable Transparency: The easiest temporary fix would be to turn off the "Acrylic" background effect in your Windows Terminal settings. If the window isn't transparent, the bug likely won't occur.

Don't Maximize: Try just resizing the Terminal window to be almost maximized instead of using the maximize button. This sometimes bypasses bugs related to window states.

@Aditya-maharshi commented on GitHub (Oct 26, 2025): The most likely culprit is the interaction between browser hardware acceleration and the acrylic transparency effect. Disable Transparency: The easiest temporary fix would be to turn off the "Acrylic" background effect in your Windows Terminal settings. If the window isn't transparent, the bug likely won't occur. Don't Maximize: Try just resizing the Terminal window to be almost maximized instead of using the maximize button. This sometimes bypasses bugs related to window states.
claunia commented 2026-01-31 08:51:46 +00:00
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@DHowett commented on GitHub (Oct 26, 2025):

Thanks for the report! Most modern browsers these days use "occlusion tracking". When another window is fully covering the browser window, they just stop rendering. It saves power and CPU time. The common implementations do not handle partially-transparent windows being placed over top of the browser.

You will need to find the specific configuration flags for your browser to disable this feature.

@DHowett commented on GitHub (Oct 26, 2025): Thanks for the report! Most modern browsers these days use "occlusion tracking". When another window is fully covering the browser window, they just stop rendering. It saves power and CPU time. The common implementations do not handle partially-transparent windows being placed over top of the browser. You will need to find the specific configuration flags for your browser to disable this feature.
claunia commented 2026-01-31 08:51:46 +00:00
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@nc7s commented on GitHub (Oct 27, 2025):

Thanks for the introduction and TIL ;)

For future reference, Firefox has the widget.windows.window_occlusion_tracking.enabled option in about:config. Chromium seems to no longer have an adjustable option right in the browser, there is a SE question about it: https://superuser.com/questions/1787650/how-to-record-web-browsers-when-their-window-is-not-in-focus

For now it seems enough to adjust the terminal window so it's a few pixels short on one side, which is kinda ugly but It Works ™

@nc7s commented on GitHub (Oct 27, 2025): Thanks for the introduction and TIL ;) For future reference, Firefox has the `widget.windows.window_occlusion_tracking.enabled` option in about:config. Chromium seems to no longer have an adjustable option right in the browser, there is a SE question about it: https://superuser.com/questions/1787650/how-to-record-web-browsers-when-their-window-is-not-in-focus For now it seems enough to adjust the terminal window so it's a few pixels short on one side, which is kinda ugly but It Works ™
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