UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.
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)
CodeBurner is a Firefox add-on that integrates with Firebug, to extend it with reference material for HTML and CSS.
Extends smooth scroll more tweakable. By keyboard scroll also supported.
Screengrab! saves webpages as images... but not for new versions of Firefox.
FF changes too fast and I don't have the time to maintain it anymore. Bugs have developed that I am not in a position to investigate.
Therefore, Screengrab is EOL.
This extension provides advanced configuration for your browser and many additional options, which are not displayed in the Firefox Preferences.
Firecookie is an extension for Firebug that makes possible to view and manage cookies in your browser
Firecookie is part of Firebug since Firebug 1.10
Allows you to hide almost anything via context menu 'Remove Object'.
Inline Code Finder is an add-on to Firebug, to be able to find HTML elements with any of the below issues:
* Inline style
Detailed description can be found athttp://www.robertnyman.com/inli...
Show some useful system information on the addon bar of firefox 4, such as the memory usage of system & firefox itself and network speed.
Use identicons to automatically generate favicons for sites without one.
Collections are groups of related add-ons that anyone can create and share.Explore Collections