I have this same problem - every time I try to click on anything I get that horrid dull ping which says it isn't recognising the mouse. Tabbing doesn't work either. I'm having to use Internet Explorer to report this!

Hi! I have the same problem here! It freezes 2-3 seconds after i open it... then i have t force it to shutdown! I'm using Win7 PT/PT.

Curious its that slide its working, even after this freeze situation!

So! What i did... i opened firefox and quickly went to plug-ins and deactivate all of them (in 4 or 5 tries before it freezes)... then start again and loaded one by one and its ok till now.... i guess it was a non working extension that was not detected by the plug-ins updates.... its working now!

Many thanks, Alessandro - that works! I disabled all plug-ins, and then all add-ons, and finally checked the User Script tab, where it turned out I had a GoogleBooks download helper - and once I disabled that, everything was OK again.

So far, anyway...

I had a very similar problem, just thought I'd post what worked for me in case anyone else is having the same. My FF4 runs ok using many basic sites such as Google or even Facebook. However, as soon as I went to a website with video on the page such as CNN, FOXnews, Youtube, etc. I found that the program would crash. I looked in the about:crashes but there was no report because it wasn't firefox crashing, it was actually windows vista crashing firefox. Long story short, I went one by one messing around with add-ons and plugins.

The solution to my problem was to DISABLE the plug-in "Shockwave Flash 10.2.152.32"

I have left all of my other plugins and addons enabled at this point and the problem has gone away. Obviously just something with the Shockwave plugin. I'll have to keep messing around with it to see if I can get a different shockwave plugin that is compatible. Good luck!

I said "So far, anyway..." - and indeed it hasn't really worked. The freezing is back, even with all add-ons and plug-ins disabled; it just takes a second or two longer before the freeze kicks in, that's all. Firefox is totally unusable.

That worked for me Alessandro, many thanks! I disabled all of the plug-ins and add-ons, and kept loading firefox (3.6.16), re-enabling another add on each time, until Firefox froze. The only time it froze for me was with "Conduit Engine 3.3.3.2" enabled. So I'm now running Firefox 3.6.16 with Conduit engine disabled, and all other add-ons and plug-ins enabled. No problems now.

I've waited until today to be sure that things were working OK and continue to do so - and yes, getting rid of that Conduit Engine thing (how it sneaked into my browser I'll never know, because I didn't install it, and I don't use Torrent of any sort) worked. But simply disabling it, as I did for all plug-ins the first time, didn't work; I had to delete it entirely. It sounds like a nasty piece of work anyway, some kind of spyware - we're much better off without it!

I had the same problem. I started in safe mode and then disabled it.