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All of a sudden I cannot watch any videos using Firefox, not even from YouTube. Why?


All of a sudden I cannot watch any videos using Firefox. All I get is a square black box. I can see them if I use Safari. Why isn't my Firefox working? What can I do? Thanks.

Additional System Details

This happened

Every time Firefox opened

This started when...

this morning

Installed Plug-ins

  • Runs Java applets using the latest installed versions of Java. For more information: Java Embedding Plugin. Run version test: Java Information.
  • Gecko default plugin
  • Plugin to support AOL Media Playback (XPCOM)
  • npmnqmp 071803000001
  • Java 1.3.1 Plug-in
  • DivX Content Upload Plug-In: Uploads DivX video in your browser!
  • DivX Browser Plug-In: Plays DivX video in your browser!
  • RealPlayer Plugin
  • Adobe Shockwave for Director Netscape plug-in, version 11.5.1
  • The Flip4Mac WMV Plugin allows you to view Windows Media content using QuickTime.
  • Shockwave Flash 10.1 r82
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in web pages. For more information, visit the QuickTime Web site.


  • User Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv: Gecko/20110614 Firefox/3.6.18

More Information

Why can't I see videos, even the ones on YouTube?

thaianna 0 solutions 2 answers

try clear the cache your firefox

Modified by thaianna

  • Top 25 Contributor
  • Moderator
437 solutions 3144 answers

Try clearing the Cache in Firefox.

Tools-> Clear Recent History -> [v] Cache

or Firefox->Preferences->Advanced->Network -> Offline storage -> [Clear Now]

Try clearing the Youtube cookie in Firefox->Preferences->Privacy

refresh page.

If that still does not work then try making the youtube url as https://

It is apparently a issue with Youtube as people with other browsers are getting the same. http://www.google.com/support/forum/p/youtube/thread?hl=en&tid=3cda4dac122b8f13

Question owner

Thank you very much. My videos are back this morning. Must've been a Firefox glitch yesterday.

macousticboy 0 solutions 2 answers

Sure as hell ain't no Youtube problem when i can watch a video on Chrome or Safari.

I cleared the history and the Youtube cookies. Still won't work!