This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

After update to 49, youtube stutters terribly (other videos too)

  • 2 tontu
  • 2 am na jafe-jafe bii
  • 2 views
  • i mujjee tontu mooy Tim

more options

Hey there. After the last update, Youtube videos started to stress my CPU more than ever. It was always not great, but now it's 90-99%. The plugin container alone takes like 20-30%. 720p videos stutter and the player itself goes to 5-10FPS, 60FPS videos completely lag. My laptop is old but it used to work just fine before the update. 360p vids work fine. As a comparison, YT and flash videos work without any problems on Edge. Firefox stutters with Flash videos, especially streams.

Tried installing h264fy, tried updating all add-ons, tried refreshing and reinstalling Firefox, checking/unchecking hardware acceleration.

Any ideas?

Hey there. After the last update, Youtube videos started to stress my CPU more than ever. It was always not great, but now it's 90-99%. The plugin container alone takes like 20-30%. 720p videos stutter and the player itself goes to 5-10FPS, 60FPS videos completely lag. My laptop is old but it used to work just fine before the update. 360p vids work fine. As a comparison, YT and flash videos work without any problems on Edge. Firefox stutters with Flash videos, especially streams. Tried installing h264fy, tried updating all add-ons, tried refreshing and reinstalling Firefox, checking/unchecking hardware acceleration. Any ideas?

All Replies (2)

more options

I installed the 48 version, plugin container does not eat up my CPU the way it does with 49, maybe that's the problem? But I wish to avoid using an old version...

more options

No video plays properly in firefox. I have tried disabling webgl and acceleration, but all of them don't help. Moving the mouse while playing helps, but this of course is stupid.

Chrome works. I think I'll try Opera next.