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The newest version of FF has some issues, especially with some of the flash elements you find here on the forums (ads and the like). There are a few comments on the FF forums about it.
I switched to Chrome, and it solved the problem. I've loved FF, until now...
I have found that when Firefox does a major update, it ends up running slow. What I have done in the past it uninstall Firefox and install an older version, then wait a month or 2 until they get the bugs worked out and then update to the newer version.
I am running the latest on an Apple and I have seen a difference in the last couple of weeks.....just after the major update.