Firefox keeps locking up...

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http://forums.fedoraforum.org – Before I say anything, I think you should know that I really like to download YouTube videos. :D I found an addon for Firefox that will download them. Great, huh? Well, it is great if Firefox would let me use it...it keeps locking up randomly...it seems to only lock up when opening a webpage, maybe it's just me. When it locks up it usually locks up for about 2 minutes at a time, which is hindering me from downloading my YouTube videos. :dis: If anyone can help, thanks, if you can't, thanks for the thought, at least. :) (HowTos)