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Numerous Firefox Crashing/Freezing Problems w/ YouTube and upon Closing


So today I all of a sudden started having a ton of problems with Firefox. I'm using version 3.6.26 and a few things have gone wrong today.

First off, when watching YouTube videos (usually right as a new video is about to load) my Firefox sometimes freezes and I have to X the program out. This has happened frequently today and only on YouTube videos. I tried using Safe Mode and this still kept happening.

Second off, I keep getting a Crash message whenever I X out Firefox normally. This means that whenever I hit the red X in the top right corner of my browser, a couple of seconds later, I get the message that Firefox has crashed, asking me if I want to send a report. I have no idea why any of this has started randomly happening and it's gotten on my nerves.

Does anyone have a clue what I can do to fix this?

Additional System Details

Installed Plug-ins

  • Office Plugin for Netscape Navigator
  • npdnu
  • npdnupdater2
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.1
  • Default Plug-in
  • Shockwave Flash 11.3 r300
  • Adobe Shockwave for Director Netscape plug-in, version
  • Adobe Shockwave for Director Netscape plug-in, version
  • iTunes Detector Plug-in
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Next Generation Java Plug-in 1.6.0_33 for Mozilla browsers
  • McAfee MSC FF plugin DLL
  • SiteAdvisor
  • 5.1.10411.0
  • The plug-in allows you to open and edit files using Microsoft Office applications


  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20120128 Firefox/3.6.26

More Information

  • Top 25 Contributor
  • Moderator
622 solutions 8020 answers

Firefox 3.6 is old and not supported. FlashPlayer 11.3 is causing many users problems. See my post /questions/934415#answer-359207