Firefox for Mac is extremely slow to load YouTube videos

Every time I go to watch a YouTube video, it takes forever for the video to begin playing. When it does finally start, the quality is often very low, at 240p or 144p. I also have Chrome and Safari installed on my laptop and they do not have any problems playing videos. It is only Firefox. Also, I do not have this problem on my family's laptop, which runs Windows. It is only on my Macbook Pro.
Also, sometimes, various websites take a very long time to load, but this is not nearly as frequent as my problem with YouTube videos.
I have tried uninstalling and reinstalling Firefox, starting in Safe Mode, disabling various add-ons and plugins, clearing browsing data, and nothing has worked.

If you have problems with current Shockwave Flash plugin versions then check this:
* see if there are updates for your graphics drive drivers
'''https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration'''
* disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
'''https://forums.adobe.com/message/4468493#TemporaryWorkaround'''
* disable hardware acceleration in the Flash plugin
'''https://forums.adobe.com/thread/891337'''
See also:
* '''http://kb.mozillazine.org/Flash#Troubleshooting'''
'''http://kb.mozillazine.org/Error_loading_websites'''
'''https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster'''
'''https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix'''
'''https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding'''
https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues?redirectlocale=en-US&redirectslug=Video+or+audio+does+not+play
https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues

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Hi AngieLynch,
Thanks for visiting Apple Support Communities.
It sounds like you're seeing some unexpected behavior in Mail.
Before troubleshooting on your computer, I'd strongly recommend backing up your data to an external hard drive with Time Machine, if you haven't already. This article can help with setting up Time Machine:
Mac Basics: Time Machine backs up your Mac
http://support.apple.com/kb/ht1427
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Post to Firefox forum; Oct.2011
Re: Quicken 2007; Mac OS 10.5
Problem: can’t import or download Qif format files into quicken from bofa or Chase. Mac can’t recognize; how do I set preferences in Firefox (or Safari).
https://support.mozilla.com/en-US/questions/new?product=desktop&category=d1&search=Firefox+for+Mac+preferences+shows+.qif+file+format+for+quicken+as+%22quicktime+image+format%22-wrong+application+and+won%27t+let+me+select+anything+else&showform=1
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Message was edited by: Thomas Sjöholm

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