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Weird issue where entire Firefox window flashes grey with a blue box on it

It seems to be related to video playback but not sure. It was happening while a video was playing full screen, and also after stopping playing/hiding a non-full-screen vi… (xem thêm)

It seems to be related to video playback but not sure. It was happening while a video was playing full screen, and also after stopping playing/hiding a non-full-screen video.

To catch the issue had to screen record at 240fps. I used Nvidia Overlay to record the issue, but was happening before the overlay was even enabled.

Disabled all addons, made no difference. HW acceleration on or off, still happened.


I tried turning on logs, and this always seemed to show up with the flash: ``` 2026-08-09 06:19:44.048000 UTC - [Parent 8388: Main Thread]: D/Widget GetWorkspaceId - calling AsyncUpdateWorkspaceID() 2026-08-09 06:19:44.048000 UTC - [Parent 8388: BackgroundThreadPool #276]: D/Widget calling GetWindowDesktopId 2026-08-09 06:19:44.048000 UTC - [Parent 8388: Main Thread]: D/Widget GetWorkspaceId - calling AsyncUpdateWorkspaceID() 2026-08-09 06:19:44.048000 UTC - [Parent 8388: Main Thread]: D/Widget GetWorkspaceId - calling AsyncUpdateWorkspaceID() 2026-08-09 06:19:44.048000 UTC - [Parent 8388: BackgroundThreadPool #276]: D/Widget called GetWindowDesktopId, hr=00000000 2026-08-09 06:19:44.048000 UTC - [Parent 8388: BackgroundThreadPool #276]: D/Widget calling GetWindowDesktopId 2026-08-09 06:19:44.048000 UTC - [Parent 8388: BackgroundThreadPool #276]: D/Widget called GetWindowDesktopId, hr=00000000 2026-08-09 06:19:44.048000 UTC - [Parent 8388: BackgroundThreadPool #276]: D/Widget calling GetWindowDesktopId 2026-08-09 06:19:44.048000 UTC - [Parent 8388: BackgroundThreadPool #276]: D/Widget called GetWindowDesktopId, hr=00000000 ```

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Cursor is not auto-hiding after taking a youtube video fullscreen on macOS

Whether a person clicks the fullscreen indicator or types F on the keyboard, the cursor will remain on screen as the video is playing until it is again moved. This also a… (xem thêm)

Whether a person clicks the fullscreen indicator or types F on the keyboard, the cursor will remain on screen as the video is playing until it is again moved. This also affects video played through the browser on steampowered.com. This issue appeared as of 143 and is still going strong in 144. This seems to be macOS specific as I am not noticing this behaviour on the Windows client. Could be a conflict with Tahoe.. I don't really know at this point.

There used to be a website where you could fire off a 'Firefox made me happy/sad' which is where I would've preferred to send this. So, have other people encountered this issue? And if so, are there any lasting solutions beyond wiggling the mouse?

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