Add-ons that extend Firebug. From http://www.webresourcesdepot.com/13-must-have-add-ons-to-strengthen-firebug/. Unfortunately, not all the add-ons are hosted on AMO.
2 971 363 users
153 407 users
YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
http://yslow.org is the official open source website.
74 151 users
FirePHP enables you to log to your Firebug Console using a simple PHP method call.
Not using Firebug 1.9+ on Firefox 8+? See http://firephp.org/
60 216 users
CodeBurner is a Firefox add-on that integrates with Firebug, to extend it with reference material for HTML and CSS.
32 537 users
Finds HTML elements matching chosen CSS selector(s) or XPath expression
27 993 users
Firebug extension to view which CSS rules are actually used.
19 730 users
Pixel Perfect is a Firefox/Firebug extension that allows web developers and designers to easily overlay a web composition over top of the developed HTML.
* Requires Firebug
15 475 users
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 at http://www.robertnyman.com/inli...
9 049 users
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
2 154 users
Logging support for web developers (PHP, Python, ColdFusion)