Addons » Web DevelopmentNeed to test your web pages out in Internet Explorer, Chrome, Safari, Opera (or anything else for that matter)?
Open With adds options to various parts of your browser for opening the current page in another browser.

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.