[krst252009]

Yes, this issue is real and affecting many Firefox users — YouTube videos show a black screen or error message, while working fine in Chrome. It’s not adblock-related, and likely tied to how YouTube’s new player interacts with Firefox’s rendering engine.

What’s Happening YouTube’s new player rollout seems to be causing playback failures in Firefox.

Users report:

Black screen or “An error occurred” message

Videos not loading at all

UI glitches on mobile and desktop

Chrome-based browsers (Brave, Edge, etc.) work fine — suggesting a compatibility issue, not a network or account problem. What You Can Try Clear Firefox cache and cookies

Corrupted data can block video rendering.

Disable hardware acceleration

Go to Settings > General > Performance and uncheck “Use recommended performance settings.”

Try Firefox in Safe Mode

Launch with extensions disabled to rule out conflicts.

Switch to YouTube’s mobile site temporarily

Use m.youtube.com — it often bypasses player issues.Use an alternate browser until fixed

Chrome, Brave, or Edge are working normally.

[gethly]

Only the incognito mode works, nothing else. Makes no sense to me. It's the second day now. Not sure if I should be angry with Google(likely) or Firefox for this. The main problem seems to be that some googlevideo.com subdomains are returning 403 errors. Strange thing is that in normal mode, the rr5 subdomain is called and returns the 403 but in incognito mode rr3 is called and that returns content just fine. I have no clue what picks the subdomains from which the videos are streamed.