Firefox hangs when maximising FF windows or ALT+TAB cycling

Hello. Im having bad performance issues since upgrading to 3.6.3 which I've never experienced before. I appreciate you cannot help me due to extremely poor detail on my behalf. I thought it worth asking for possible remedy in the hope that its a problem experienced by many.
The problem is more likely to occur when many Firefox windows & tabs are open and other memory hungry packages ie GTA Libery City are using all available memory resource.
Firefox will either not respond ( wont maximise window ) or the Firefox window appears, navigation icons are visible but remainder of page is blank/white. The symptons are very similar to any package running in windows thats forced to wait whilst windows pages memory.
As I can never guarantee to reproduce, I cannot say for certain what events are likely to trigger.
I have noticed that more tabs/windows open the greater the probability of a problem and im fairly certain any webpage running java increases probability of a problem. This isnt caused by insufficient hardware resources because other packages ie uTorrent respond without problem in a split second.
I can wait from 10 seconds to 2 minutes before FF begins to respond. Sometimes I have to close FF totally.
I've read FAQs http://support.mozilla.com/en-US/kb/Firefox+hangs#Hang_loading_every_window and well the FF open a long time to shutdown/restart and hmm it could be said power cycling pc or restarting FF is a solution, but those kind of solutions faded away with Windows98.
I dont plan to start changing task priorities or setting CPU affinity etc as a permanent solution.
Im thinking solutions available are:
Reload an older version of FF.
But before I do, I thought I would post and see if its a problem due to be fixed or if you think the problem is worth a deeper look and wish me to provide more data.
I apologise for reporting a problem in such a vague manner but Im struggling to find any facts that I believe are relevant and usefull to you. I susoect you will be unable to help..
But anyway.. a Huge Thankyou to all the peeps who've contributed to making FF a top quality program.
== This happened ==
Not sure how often
== Since automatic update to v3.63

Reverting to an old version of FF worked!!! WHOOHOOOOO!!!!!!

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