Mac, FF up through 4.0, "Refresh" doesn't fix slowness; undo it to recover extensions?
Best current guess is that flushing the "dyld" cache with Onyx seems to fix the problem for a few days or a week before it returns. The slowness (spinning rainbow) is by far the worst in Firefox tho' other apps and Finder also begin to show it once it starts.
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Unfortunately the extensions need to be reinstalled. Please first try these steps:
Correction, the default extensions will still be there.
Modified by guigs
In theory, you can recover the settings from the Old Firefox Data folder after a Refresh by copying its contents to the right spot. This is the only thread I remember about doing that on Mac, and the user didn't report back on whether it worked: https://support.mozilla.org/questions/1074549
Actually, here's a second one with no report back on whether it worked: https://support.mozilla.org/questions/1058258