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

youtube videos play slow frame rate

  • 7 cavab
  • 75 have this problem
  • 1 view
  • Last reply by Tristan C.

more options

I'm using Firefox 13 and some videos on youtube the audio is fine, but the video is playing at a slow frame rate. I just tried it on a system running Firefox 12 and it works fine. Please investigate.

I'm using Firefox 13 and some videos on youtube the audio is fine, but the video is playing at a slow frame rate. I just tried it on a system running Firefox 12 and it works fine. Please investigate.

All Replies (7)

more options

Hello jricci9,

please be aware that Firefox 13 is currently in Beta and therefore, can and will most likely give you some errors and bugs, but this issue should normally be fixed with the stable launch of it. However, your issue seems to be due to some of the plugins in use on your system. Please check for updates on the plugincheck page and upgrade them if needed. If no updates can be found, launch Firefox with Add-Ons disabled and see if that fixes your problem. You can then remove the Shockwave Flash plugin and reinstall it from the Adobe website.

Thank you for your patience and please let me know how it goes.

Modified by Tristan C.

more options

I just installed FF 12 and it still does it...I'm investigating more...I will check plugins...other suggestions?

more options

Hello jricci9,

as stated in an earlier reply, I would suggest you to run the plugincheck and see what it brings up and then try to launch Firefox in Add-Ons-disabled mode. If the problem still occurs, try to remove the Shockwave Flash plugin and reinstall it from the official website.

more options

Ok, just updated all of the plugins, silverlight was the only one out of date. Still slow, SOME videos on youtube, not all. And here is more interesting info...I posted the video to my facebook wall and when played thru youtube via facebook the video is fine, but when viewed directly on youtube's page, the frame rate is slow. Does that help?

more options

BTW, plays fine in IE on the same system!

more options

I found the answer...in youtube when I right clicked on the video I selected LEAVE THE HTML5 test and that fixed it. So it's firefox and HTML5. I hope this helps you!

more options

Hello jricci9,

thank you very much for your solution as it will surely help us troubleshoot some similar issues in the future.

Thanks a lot for all your valuable time and all your interest in Mozilla Firefox. Have a great day now!