View HTTP headers of a page and while browsing.
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.
Help make Firefox better. The Add-on Compatibility Reporter enables you to report if the Firefox add-ons that you're using are working properly.
Offers the possibility to display documents in browser window.
Toggle word wrapping and PRE element wrapping in the message composition and HTML display windows, respectively.