Andy Brudtkuhl's Library tagged extension →  View Popular, Search in Google

Seoquake is a powerful tool for Mozilla Firefox and for Internet Explorer, aimed at helping web masters who deal with search engine optimization and internet promotion of web sites. Seoquake allows user to obtain and investigate many important SEO parameters of the internet project under study on the fly.

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Very cool - play NES ROMS via built-in emulator that's a Firefox extension...

"If you didn't notice from reading my last massive time waster, I love classic gaming. I'm also a Firefox user, and always on the hunt for good addons like the rest of you. Thank god for FireNES, an awesome addon for Firefox that gives you ready access to a massive repository of NES games.

After you install it, customize your toolbar and add the FireNES button to give yourself one-click access to the sidebar. The full ROMs list is massive, The toplist contains the 100-or-so most played titles, and you can add any game to your list of favorites with a simple right click."

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Today let's take a look at how one goes about creating these magical extensions. The active ingredient is XUL, a markup language (the eXtensible [or "XML-Based"] User-interface Language, to be precise) that describes things like toolbars, menus, keyboard

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FireBug lets you explore the far corners of the DOM by keyboard or mouse. All of the tools you need to poke, prod, and monitor your JavaScript, CSS, HTML and Ajax are brought together into one seamless experience, including a debugger, error console, comm

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JustBlogIt is a Mozilla / Firefox extension to allow easy right-click posting to a weblog. From any website your new blog post is only a right-click away.

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