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youtube will not load


Youtube videos will not open on my Mac, which is running 0s 10.7 Lion. I have no problems viewing Youtube on Safari. I converted to Lion a few weeks ago.

Additional System Details

Sites Affected


Installed Plug-ins

  • Cooliris embbedded in a tab
  • Microsoft Office for Mac SharePoint Browser Plug-in
  • iPhoto6
  • 4.0.51204.0
  • LogMeIn remote control components
  • The Flip4Mac WMV Plugin allows you to view Windows Media content using QuickTime.
  • Displays Java applet content, or a placeholder if Java is not installed.
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in web pages. For more information, visit the QuickTime Web site.
  • Version
  • Google Talk Plugin Video Accelerator version:
  • Shockwave Flash 11.0 d1


  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:5.0.1) Gecko/20100101 Firefox/5.0.1

More Information

Using a MacBook Pro mid-2010, with i7, 2.8 ghz and 8gigs of RAM. Was not having a problem viewing Youtube when running Snow Leopard. Also not having a problem loading Youtube on the MacBook Pro when using Safari.

Hasan 477 solutions 5600 answers

Troubleshooting extensions and themes

Also see this- Taken from: https://support.mozilla.com/en-US/questions/856001

kingp1ng: I had both Easy Youtube Video Downloader and NewTabKing. Both stopped working. Uninstalled both. Problem fixed.

ice792: Try Video DownloadHelper 4.9.4 Really easy to use, you´ll get used to it quickly.

Check and tell if its working.

Question owner

Thanks for the tip. Unfortunately, removing the Youtube downloader add-ons did not solve the problem. Something is blocking the videos from running on Firefox, but I have no similar problem with Safari. The network and encryption settings appear to be the same on both browsers.

Hasan 477 solutions 5600 answers

How do I install the Flash plugin?

Managing the Flash plugin

Check and tell if its working.