View HTTP headers of a page and while browsing.
CodeBurner is a Firefox add-on that integrates with Firebug, to extend it with reference material for HTML and CSS.
DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
Dust-Me Selectors is development tool to remove unused CSS selectors.
Useful tools for the nightly tester.
Lets you take a peek at the files under the hood of your Firefox installation and profile...
Ever needed to restart Firefox after enabling or disabling an extension, switching to a new theme, or modifying configuration files (such as userChrome.css or user.js)?
This simple extension adds a "Restart Firefox" item to the "File" menu. You can ...
This addon helps extension developers by providing easy way to restart Firefox. It also clears XPCOM cache during restart so that developer doesnt need to do it manually. It also helps loading unpacked addon source mainly used during development.