It's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?

Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in safe mode (don't forget to select Disable all add-ons when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See this article for information about troubleshooting extensions and themes and this one for plugins.

If you need support for one of your add-ons, you'll have to contact its author.

If the problem does not disappear when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.

Reinstalled 3.6.10, disabled all plug-ins. FF crashes every 2 min. Anything new? Thanks. kissys

This doesn't help, although tried every update of Firefox, the Media applications crashes very often. Tried with Flash/silver lite blocker, even though it crashes.

Don't know when this problem gets solved.

It's ridiculous, when all tabs get crashed, if one of it is giving problem for rendering.

What is ridiculous is the amount of people that simply read past helpful advice and decide they don't need it, only to complain about not getting any (advice, that is).

Please read this post and follow its instructions correctly. If you need help, just ask.