Firefox 4.0 all of a sudden starts hanging. Tried everything please help.

Okay so I've had firefox 4.0 for months now and all of a sudden it started hanging every few seconds. Now I since this happened I've been looking everywhere for a solution.
I've tried uninstalling it and re-installing 3.6.15. I tried starting it in safe mode and having ALL of my add-ons and everything disabled. I tried creating a new profile, but that still didn't work. I made sure all my plug-ins were up to date and they are.
The first thing I did was run a system wide scan with Norton Internet Security to see if there was a virus and nothing showed up. I've literally tried EVERYTHING I could possibly think of so please please help would be very much appreciated.

Just read that the default memory storage on FF is set to 5 mbs. You can up that by clicking on tools, advanced and overriding the default and set it to 50 mbs (if you use lots of tabs) or 10 mbs (if you use just a few).
I open a blank tab and clear the cache periodically, while I am working. I can have several tabs open and watch videos on Youtube, by doing this. Have you cleared your cache?
Since I have an older computer, I've also used CCleaner for years. I use it often, but always before signing off. You can get it free...search for CCleaner, download from Pirifoam free. I didn't change any of the settings and it clears crap left behind from uninstalling programs, clears all browsers at once of: cookies, history, passwords, etc. I love it!
I had freezing, before using the "open blank tab, clear the cache" thing. Now I have no problems. Plus, as I said...you can change the default memory usage for FF and that should help too.
Hope this helps! Good luck! :)

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