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Firefox crashes


Well, hello gentlemen!

Today, I awoke and found my computer incapable of using firefox to view youtube.

Before you say it, yes. It works on Chrome and IE.

Flash player seems to be at: * Shockwave Flash 11.7 r700

My firefox is at revision 21.

Does anyone know how to fix this issue? I refuse to abandon Firefox.

My operating system? Vista 64 bit (The PC itself is four years old, and well maintained.)

Malwarebytes/Spybot/Super anti spyware/norton all come up clean. No viruses.

My GPU is up to date.

Any clues, gentlemen?

Additional System Details

Installed Plug-ins

  • Google Update
  • Shockwave Flash 11.7 r700
  • Next Generation Java Plug-in 10.21.2 for Mozilla browsers
  • Unity Player 3.5.6f4
  • 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 (Windows NT 6.0; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0

More Information

  • Top 10 Contributor
  • Moderator
10749 solutions 96724 answers

Helpful Reply

Clear the cache and the cookies from websites that cause problems.

"Clear the Cache":

  • Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.

You can check for problems with current Flash plugin versions and try these:

  • disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed
  • disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
  • disable hardware acceleration in the Flash plugin

Question owner

The 'disabling' protection mode worked.

Tell me, is there any other way of fixing this? I dislike the thought of being unprotected.

Will it be patched soon, or..?