I downloaded the new Firefox but it constantly freezes, doing absolutely nothing, and I can't even close it from my Mac dock bar, I have to turn off my laptop using the power button as Firefox won't let me shut down. What can I do?

Hi
I recently downloaded the new Firefox (Firefox 4, I think - you can tell I'm very tech savvy!) and it constantly freezes, I can't do anything with it at all - I can't even close it from the icon in my Mac dock bar.
I have tried restarting my computer - though I have to turn it off by using the power button as as Firefox is open and totally unresponsive it won't let me shut down. About a minute after re-starting Firefox, restoring my tabs or starting afresh, it freezes again.
This is obviously very annoying and I'm not sure what I can do about it. Firefox is my preferred browser, and I'd really like to be able to use it again!

This is not a reply. I just want to elaborate on this problem.
My computer freezes occasionally when it is used after being sleep for a while. The spinning ball appears and everything is totally disabled. Nothing on the keyboard works.
The mouse moves, but does not work.
The only solution is to turn the power off and on (losing all data in open applications.)
I kept the System monitor running on the side to find out which program was running when the computer froze. The Monitor as well as all other applications froze, but the data showed:
Firefox 18.4%
Activity Monitor 0.9%
Firefox Plugin 0.2%
This is all the information I have. By the way, I am using iMac with OS 10.6.

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