Firefox: Web Developer Extension
April 30th, 2008 . by Star 
The Firefox Web Developer Extension toolbar pins to the browser top along with your other toolbars, and is available from the browser’s menubar “Tools” button. The photo above shows the Outline Block Level Elements feature. The Drop-down, hierarchical menus makes navigating the many features very easy and accessible. There are way too many features to describe individually, but the top-level navigation selections, and a few standout components are well noted. These are; Disable, Cookies, CSS, Forms, Images, Informations, Miscellaneous, Outline, Resize, Tools, View Source and Options.
(Source: htmlgoodies)
