At the risk of sounding like Peter Stormare, I link to Chris Morrell who has a list of good Firefox Tweaks, Extensions and Optimizations
Chris Morell explains everything clearly and provides screenshots to make it easie. I've already used a couple of tweaks on my laptop to save memory since the laptop only has 256MB ram.
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Technorati Tags: Firefox, Browsers, Extensions, Tweaks, Optimizations
Rushi's Ramblings 