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Youtube videos not loading


Since last night FIrefox won't load youtube videos, all I get is a black box where the video normally plays. The videos load fine in both Chrome and IE. I started Firefox in safe mode but that didn't help.

URL of affected sites


Additional System Details

Installed Plug-ins

  • -getplusplusadobe16263
  • Office Plugin for Netscape Navigator
  • Default Plug-in
  • Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Google Update
  • Shockwave Flash 10.1 r53
  • Yahoo Application State Plugin version
  • 3.0.40624.0
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
  • Npdsplay dll
  • DRM Store Netscape Plugin
  • DRM Netscape Network Object


  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729)

More Information

  • Moderator
67 solutions 450 answers

Hello BrianInNYC,

please clear your cache and cookies, by following these steps:

  1. Open the Tools menu at the top of the Firefox window, select Clear recent history
  2. In the Clear recent history window, select Everything from the dropdown list.
  3. Click the arrow next to Details once, then check Cache and Cookies.
  4. Now, click the Clear now button to clear history.

Kind regards, Tobbi Firefox Support Volunteer

Question owner

Thanks Tobbi for the quick reply, that seemed to fix the problem.