Add-ons for web development and extension development.
2 717 207 gebruikers
773 059 gebruikers
Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.
672 931 gebruikers
The Web Developer extension adds various web developer tools to the browser.
131 097 gebruikers
Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...
149 102 gebruikers
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.
300 390 gebruikers
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
202 269 gebruikers
View HTTP headers of a page and while browsing.
475 181 gebruikers
Lightbeam is a Firefox add-on that enables you to see the first and third party sites you interact with on the Web. Using interactive visualizations, Lightbeam shows you the relationships between these third parties and the sites you visit.
60 190 gebruikers
42 644 gebruikers
Manages the Remote XUL whitelist to allow websites and local files to load XUL content.
36 538 gebruikers
Adds an about:addons-memory page that details add-on memory usage
169 432 gebruikers
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.