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I'm on a Mac using Mac OS Big Sur, 11.7.10.

Videos will not play on Firefox, whether on Youtube, in social media, on websites, or whatever. Sometimes the video will play with no audio, sometimes I just getting a rolling wheel.

I have other functionality issues that may be related.

I don't want to close and restart all the time. I am considering changing to a new default browser over the issue.

If I switch to Chrome or Safari, the videos play fine. Which seems like my answer.

When switching to full-screen mode in Firefox while watching a video, the cursor won't disappear automatically until you move it. This issue affects all players except the native Firefox player. The bug appeared in version 143 and higher (affects all builds, including stable, Beta, and Nightly). I've tested the issue by rolling back the browser to versions 140 and 142.0.1, and everything works fine. There's a thread about this issue on the Bugzilla forum. macOS versions Tahoe 26.0 and Sequoia 15.7 are currently running. I can't test on other systems.

Since my Firefox updated, the audio system is not work that I miss most virtual meetings. I tried multiple times but I cannot update to play the audio system. Please help the steps to set up my computer system. Thank you. Jong Lee

i bought a GMKtec K12 Mini PC AMD Ryzen7 H 255 (Upgraded 8745HS) Oculink Support DDR5 and youtube videos at 4k 60 hz stutter big time when i log in to my youtube acount.i am a premium user.all driver are up to date.my intel laptops using firefox browser work perfect no frame drop whatsoever.i have bought 2 of this mini pc and bouth behaving same on firefox(i tried on all firefox browsers: F.NIGHTLY,FOR DEVELOPERS,ESR) I also have an laptop with AMD cpu and behave same: stutters on 4k 60hz. Recently i tried FLORP browser and youtube 4k 60hz works perfect until i log in to my youtube acount and then it starts stuttering and loosing frames big time so bad i even cannot watch the video.ive tried on trubleshoot mode ,started from scrtach with same results

Hi Team

I am facing 2 issue as below.

1. The issue the when I play the video on 2x in YouTube then video and audio both stats lagging.

2. When I am watching any video on YouTube in firefox and minimise it and again open the browser then is open in landscape mode although my auto rotating in off.

There are these 2 bugs which i have found.

Rest are Awesome you are doing great work.

Thank.

Jasvir

When I play a downloaded video that is in English, my downloaded file plays back in a foreign language, not English. What am I doing to cause this and how can I have the English version only in playback everytime? Thank you so much, being a pensioner I am eager awaiting the ability to donate to you excellent work as often as I like.

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?

Respected one, since 2 days ago, the sound was lost when playing video content on platform X. I did not make any changes in the settings for M.F. not even in PC, I HAVEN'T CHANGED ANYTHING FOR MONTHS. Do you have any ideas, advice... Thank You for taking the time to solve my problem.