The Web Developer extension adds a menu and a toolbar to the browser with various web developer tools.

Tools included:

• The disable features allow the disabling of various features including the cache, JavaScript and page colors.
• The cookies features provide various cookie related tools including disabling, adding and viewing cookies.
• The CSS features provide various tools related to the CSS on the page including displaying the styles applied to the selected element and live editing of the CSS.
• The forms features provide the ability to manipulate the forms on the page including display the form details and populating form fields.
• The images features provide various image related tools including finding broken images and outlining images.
• The information features provide various informational tools including displaying element information and viewing the document size.
• The miscellaneous features provide various tools including displaying a ruler and live editing of the HTML.
• The outline features allow the outlining of various elements including block level and positioned elements.
• The tools features allow an unlimited number of configurable tools including validating the CSS and the HTML.