Hello Andy.

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 theme and this one for plugins.

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

Hi Morbus, Thanks for the reply, unfortunately this leaves things in a state of "Twilight Zone" Previously, certain sites and content would cause FF to either crash or not play the media. I did as you said and disabled all addons and tested 1 particular site, and suddenly the camtasia movie started playing. I thought Great!, and decided to see what addon would be causing this. I stepped through every addon refreshing the page before playing, and every time the media played OK. ( FiddlerHook 2.2.4.7 - Firebug 1.5.4 - Java Console 6.0.20 - Java Quick Starter 1.0 - MS .NET Framework Assistant 1.2.1)

So therefore I think perhaps that in the case of the media problems (I can't check the crashing just yet), that FF 3.6.6 had some headache that just needed the add-ons restarting ( have you tried tunring it off and on again? pc support fix #1)

This has never been necessary in any previous version of FF and FF always has performed exemplory, but I 'm not yet convinced about 3.6.6

I'll try and check the crash thing asap.

It's weird, but it's great that it worked. Some problems with some add-ons are, indeed, known to be fixed by disabling them and enabling them again, and it's problems with add-ons, not Firefox. For example, RealMedia Record Plugin has a known issue of causing Firefox to render the title bar with Chinese characters. It's very weird and users don't have a clue what's causing it. However, disabling the add-on and enabling it again fixes it.

This kind of problems should be frequent, in any case, and it's unlikely you'll experience them in future updates.

I have this problem with plugins, but with Firefox 3.6.8, running on a laptop with Windows Vista. The plugin that crashes mostly for me is the Adobe Flash Player plugin. This is required by almost every website I use (especially Facebook & YouTube). It's been crashing several times a day for a while. I have updated the Flash Plugin, which hasn't fixed the problem, this is making me really angry, please help.

I'm getting frequent Flash crashes (five or six per hour) when trying to stream audio, both several days ago with 3.6 and now with 4.0 on a Windows 7 machine. Very annoying.