"Here is my notebook on how to create an extension for firefox. The following example was tested with firefox 2.0.0.11. This extension is used to insert a few default templates (such as Template:Infobox_scientist ) when editing a biography on Wikipedia. Infoboxes are used , for example by DBPedia, to create a structured version of wikipedia..."

NoScript creator Giorgio Maone has released version 2.0 of his open source extension for Mozilla's Firefox browser, adding several new changes and improving its overall reliability

It's almost exciting as Alien vs. Predator, only a little more sad. It's a tale of two Firefox addon developers, Giorgio Maone wielding Noscript and Wladimir Palant brandishing Adblock Plus, crossing swords in a battle of egos and subterfuge, while the poor world of Firefox users watched in consternation.

Adblock Plus is an extension for Firefox, Thunderbird, and several other applications with the primary goal of removing advertisements. For that, it will look at all requests made by web pages and block the request if the address the request should go to matches a filter in Adblock Plus.

Ubiquity is a very popular Firefox extension that adds a flexible natural language command line to Firefox, and is developed by the folks at Mozilla. It's now out in a more useful new version, with a sleeker look, a more stable core, and the ability to create good looking skins.

GNUCitizen.org has discovered a way for malicious JAVA scripts to be hidden in a page that will be automatically extracted by Firefox’s JAVA reader. There is an easy fix if you install the NoScript Firefox extension, but this means that you’ll be running absolutely no scripts, making for a far more boring web browsing experience.

"There has been some discussion about shipping it with Firefox 3, but I think that has been put behind in favor of an extension to Firefox so we can follow our own timeline. Luckily, FF3 has a new neat feature that allow you to pass the -app parameter to run a xul application. Nifty..."

"At last, you can download and use an alpha WengoPhone Firefox extension for GNU/Linux. It has been flagged alpha because, as you may know, GNU/Linux systems are very different from each others, so it's difficult to provide a WengoPhone Firefox extension that works blissfully on most of them. We'd like, by publishing this alpha version, to test WengoPhone Firefox extension for GNU/Linux on the largest number of different GNU/Linux distributions. For this, we'd be pleased that you follow the small set of instructions below, it will greatly help us to publish a stable and robust version soon! ..."

Why bother using a dedicated FTP client when you can use FireFTP? This nifty extension turns Firefox into a full-fledged FTP tool, so you can transfer files back and forth without leaving the browser. FireFTP offers all the features you'd expect from a decent FTP client.
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Installing FireFTP is a matter of clicking on its .xpi package and restarting Firefox.