Firefox is sluggish and streaming video is choppy [solved]

I got a brand new 2010 8-core mac pro with 12 GB ram, and was horribly disappointed to find that streaming video on Hulu and Netflix still stuttered. Why is Apple’s second fastest machine worse than my iPhone at playing Netflix video? Flash is an infamous hog on mac, but Firefox in general was slow when hovering over links and clicking on things. Netflix uses silverlight too, so it’s bizarre that it would also stutter.
Running Netflix and Hulu in Safari worked fine, but I missed features in Firefox. So in Firefox I went into Tools > Add-ons, disabled everything and restarted. Everything was zippy again. Then I slowly enabled add-ons one at a time.
The culprit seems to be Firebug and the enormous cache it keeps. For now, I have disabled Firebug, and only enable it when developing.

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