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Firefox 12 does this too, on both my MB Pro and iMac. I think it has to flush so many caches that disk I/O just takes forever. This is purely conjecture, though.



Not sure if it will help, but have you tried running Firefox's hidden profile manager and created a new profile? Firefox was horrible to run on OS X for me, it would drag the whole system down, but since changing to a new profile it has run like a dream and not reverted back.


Creating a new FF profile made a significant difference for me, too, when I did it recently (for the first time in a couple years). I suspect that will be true on any OS, if you do a fair amount of installing and removing extensions, user scripts, etc.


"Vacuuming" your Firefox profile's .sqlite files also helps.




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