Firefox 3.6.13 hangs freezes repeatedly with multiple tabs open

I am running FF v3.6.13 on a Vista laptop. I typically have over 60 tabs open during a session (pretty much the same ones each time). In the last two weeks, FF has started freezing repeatedly while these tabs are open, whether I am using it or it is sitting idle. I either get a dialog box stating that Firefox is not responding and asking if I want to end it or wait for it to respond, or it simply hangs and I have to kill it via Task Manager.
However, if I run FF with only a few tabs open, it remains running and stable. So, I don't believe it is an extension problem.
Any ideas what is happening?

@ Falling Rock
You seem to have found a plausible answer to the problem. 
But at least as I view your post it is breaking the post container, I will repeat your answer and add line breaks in an attempt to make it easier for those like myself to view what you have written; without requiring excessive scrolling.
Repeat of above post
''Hey, M.,
I have had this problem with v3.6.13 and earlier versions, too, but I never was anywhere near 60 tabs! WOwwww! 
IMHO, the "issue"is probably caused by your having stretched your virtual memory too far. 
My system is XP Pro x86 SP3 with only 2 GB RAM; you must have 4GB or upwards on a 64-bit system, to grow to 60 tabs. Mine gets flaky around 12-15, esp. with a Word doc window or two running as well. Mine used to go troublesome around 8 or so, but I increased my Virtual Memory setting in Windows. You might try increasing the virtual memory setting significantly, if Windows will let you. See if that will help your problem. Good luck!
''

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Firefox 3.6.13 hangs freezes repeatedly with multiple tabs open

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