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I'm not entirely certain, but I think I've had this problem with Firefox on Linux for about three years, getting progressively worse. I wonder what browser the Firefox developers actually use, because they certainly can't be eating their own dogfood.
Strange OS interactions can bite you in the ass sometimes. For example, installing or touching any font causes a fontconfig cache rebuild that can take minutes if you have big (CJK) fonts installed, triggering on next app start (affects Firefox, Chromium equally).
I would strace Firefox when it's exhibiting the problem to try to figure out what it's doing. It could be caused by a deep dependency and not something inherent to Firefox itself.
How can I strace "when it's exhibiting the problem"?
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