Diễn đàn hỗ trợ Firefox

Issue Description: I’m experiencing a problem with fullscreen mode while using YouTube on Firefox on Windows 11 with a dual-monitor setup. When I enter fullscreen, the video does not cover the entire screen. Instead, I can still see parts of the Windows desktop or background around the edges of the display.

This issue only happens on Firefox and only when using fullscreen mode on one of my monitors. I have already checked my display settings, scaling, alignment, and hardware acceleration, but the problem persists.

System Details:

Windows 11

Dual-monitor setup

Browser: Firefox (latest version)

Issue: Fullscreen video shows borders and does not fully cover the screen

Expected Behavior: The fullscreen video should completely fill the selected monitor without showing any part of the Windows desktop.

Please advise on how to resolve this issue.

I'm on Ubuntu (LTS) FF 145.0.2

The audio plays fine, but the video (youtube) freezes like every 40s or so. Playing videos in MPV or Brave is flawless. I dont see extra ordinary CPU activity or anything obvious.

Ideas why this could be?

Lost my audio on Firefox. All movies and web site videos SILENT

Strange exceptions: e.g., can't ear video on youtube.com; BUT, CAN hear it if web page has LINK to YouTube!?!? SOME Twitter videous have audio; others are silent

How do I turn Firefox audio back ON?

how can a firefox145 (on Win11) update be rolled back?

it seems update 145.0.2 has killed all audio in firefox. Other browsers and programs have functioning audio. But nothing restores audio in FireFox after the update. I have closed and re-started FF - even hot and cold reboots of the machine. It is clearly a FF issue. The only solution appears to be a roll back, unless there is a preferences line that might have been shifted.