Addons » Web DevelopmentInline Code Finder is an add-on to Firebug, to be able to find HTML elements with any of the below issues:
* Inline JavaScript events
* Inline style
* javascript: links
Detailed description can be found at http://www.robertnyman.com/inline-code-finder/

See also
FireXPathFireXPath is a Firebug extension that adds a development tool to edit, inspect and generate XPath expressions.
FirediffTrack Changes in Firebug
TortoiseSVN MenuAdd TortoiseSVN commands to link context menus to allow easily browsing Subversion repositories. Must have TortoiseSVN already installed.
FirecookieFirecookie is an extension for Firebug that makes possible to view and manage cookies in your browser
Library DetectorDetects what javascript libraries are being used on the current page and displays the result as icons with detailed tooltips in the statusbar.