Firefox hogs resources and brings Mac to a crawl after a while

I am running Snow Leopard 10.6.8, latest updates. FireFox 6.0.2. After running for a while, the number of threads, amount of RAM taken up are huge. The system comes to a crawl, and I have to Force Quit (Firefox is not responding). This may be after a day of use. Are others experiencing these issues? Have any suggestions?
I have the following plug-ins:
Add-On Compatibility Reporter 0.9
DownThemAll 2.0.7
GMarks 1.0.3.3

I have 2 gigs of RAM. Keep in mind I have used Studio 1 and 2 on this computer with great success (at 1 gig of ram!), and had little to no problems with Studio 3 (at 2 gigs of ram) until I installed Snow Leopard.
I also did the clean install because I personally don't like the idea of running an upgrade on either an OS or a FCS update. Past experience has taught me this. I've been using FCP since 2000 (version 1.25).
Motion was great before SL - version 4 was 30x more stable than 3. But I haven't played with it since updating, so I can't speak of that. Only FCP7. I have never seen FCP take 30 minutes to export a 30 minute DV timeline. Not since FCP3 (if even then!). It just slows the computer down to molasses speeds. I can usually run an app like Safari or even Photoshop in the background when I'm exporting, but no longer. I get lovely pinwheels of death and major slow-down (to the point that computer is non-functional and almost ready to crash). So yeah, it's just super slow, until I quit Final Cut. Then the speed comes right back.
I've also encountered this on my nVidia MacBook.....

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