Firefox AddOns & Extensions

Beginner

PrintPreview∞ lets you add a PrintPreview button to your toolbar
ForecastFox∞ lets you add weather forecasts to your StatusBar
ColourfulTabs∞ ColourfulTabs
TabMixPlus∞ TabMixPlus

Intermediate

CopyPlainText∞ allows you to copy text without (HTML) formatting
ImgLikeOpera∞ lets you control which images are loaded
DelIcioUs∞ DelIcioUs
SageRss∞ SageRss

Advanced

ViewCookies∞ lets you view the cookies on a web page
ColorZilla∞ give you an eye dropper, colour picker, page zoomer and more
HtmlValidator∞ HtmlValidator
Firebug∞ JavaScript debugger
WebDeveloper∞ WebDeveloper
EditCSS∞ lets you add and edit the CSS of any and every web page you visit
∞

Extensions with extensions !

GreaseMonkey lets you add extra JavaScript to any and every web page you visit (actually GreaseMonkey doesn't do anything apart from add a monkey button and three menu commands until you install GreaseMonkeyUserScripts !)

More Extensions

https://addons.mozilla.org/extensions/?application=firefox∞

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REFERRERS
GreaseMonkey