Notice: some important features (XML indentation and load old saved requests) are missing in version 2.0.0, please update to version 2.0.1.
Please follow the link ("View other versions") below To install version 2.0.1.
Allows the download manager to also open in a tab or sidebar, and adds some optional display changes.
Adds the ability to create and edit entries in the password manager.
The greatest user script engine on the Internet (a fork of Greasemonkey).
Make any pages' search functionality available in the Search Bar (or "search box")...
Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon
For Firefox 23+, you need 0.958 (under review)
Control what gets sent as the HTTP Referer on a per-site basis.
Adds an about:addons-memory page that details add-on memory usage
Cookie Monster provides proactive cookie management on a site or domain level basis, including 3rd party cookies. Via the status bar, it provides easy access to enhanced cookie functionality, while doing so in a non-intrusive manner.