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Greasemonkey
A Firefox ad-on that uses small bits of JavaScript to customizes a webpage display...
customize plugin write script customization customize Firefox
Greasemonkey for Songbird
A Songbird extension that allows you to customize the way webpages look and function...
change customize customize browser enhance enhance functionality
Better Google Website Optimizer
A Firefox extension that helps you easily manage your Google Website Optimizer application...
Google compile optimize Google Website Optimizer optimize Google