Aardvark
Powerful and user-friendly "selector" utility for selecting elements and doing various actions on them. It can be used for cleaning up a page prior to printing it (by removing and isolating elements), for making the page more readable, and (most appreciated by web developers), for analyzing the structure of a page.To use Aardvark, just right-click on the page and select "Start Aardvark" from the popup menu. As you move the mouse over the page, you will see a red rectangle around the current block element, along with a label showing its type, and if they exist, its id, class, and style. You can then press various keys on the keyboard to do things, for instance W to navigate wider (as shown in the image), R to remove the element, I to isolate the element (that is, remove everything else on the page), V to view formatted source of that element, U to undo, Q to quit aardvark, and H for help, that is, a list of the 12 available keystrokes.
Supported 
versions: Firefox 1.5 - 2.0.0.* ALL
Notes / Comments: There are many minor improvements and bug fixes. Its code has been completely reworked to make it easily extensible, so that other extensions can use its selector, or otherwise modify its behavior.
Categories: Developer Tools, Web Annoyances
Aardvark:
![Download Aardvark [Firefox plugin]](http://www.ffextensions.com/images/download.gif)
Install: Aardvark
