"Greasemonkey is a Firefox extension that gives you tremendous control over how a page appears in your browser. If you can imagine JavaScript that you wish would run when a site loads, you can make it so. Rearrange a site's layout, hide annoying elements (ads?), or replace every occurrence of "David Lee Roth" with "Sammy Hagar." All it takes is a few lines of JavaScript and the Greasemonkey extension. "[via web monkey]
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