Constant "spinning wait cursor" when using firefox 3.6.13 on a MacPro 1,1 2006 with 11GB of memory

After about 1 hour of use I am getting the "spinning wait cursor" in firefox when I do pretty much anything. Scrolling, link hovers, switching tabs, inspecting DOM tags in firebug, typing in textboxes, you name it. This only recently started happening on my MacPro, and has yet to rear its ugly head on my MacbookPro laptop. Not sure if its my RAM or something....regardless, basically makes firefox useless. In fact, im posting this question in Chrome.
Usually when firefox gets slow I run SQLite VACCUUM on the profile databases and it helps. This time, no dice. Basically just unusable.
Machine Specs:
OS X Version: 10.6.6
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 11 GB
Bus Speed: 1.33 GHz
Memory Speed: 667 MHz DDR2 FB-DIMM

After about 1 hour of use I am getting the "spinning wait cursor" in firefox when I do pretty much anything. Scrolling, link hovers, switching tabs, inspecting DOM tags in firebug, typing in textboxes, you name it. This only recently started happening on my MacPro, and has yet to rear its ugly head on my MacbookPro laptop. Not sure if its my RAM or something....regardless, basically makes firefox useless. In fact, im posting this question in Chrome.
Usually when firefox gets slow I run SQLite VACCUUM on the profile databases and it helps. This time, no dice. Basically just unusable.
Machine Specs:
OS X Version: 10.6.6
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 11 GB
Bus Speed: 1.33 GHz
Memory Speed: 667 MHz DDR2 FB-DIMM

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