Dust-Me Selectors
A Firefox extension (for v1.5 or later) that finds unused CSS selectors. It extracts all of the selectors from all of the style sheets on the page you're viewing, then analyzes that page to see which of those selectors are not used. The data is then stored so that when testing subsequent pages, selectors can be crossed off the list as they're encountered.
Aardvark Firefox Extension
With Aardvark, you can: clean up unwanted banners and surrounding "fluff," especially prior to printing a page; see how a page is created, block by block; and view the source code of one or more elements.
CSSViewer
A CSS property viewer that displays all information about a design element.
Dummy Lipsum
This Firefox extension dynamically fills a selected field with Lorem ipsum text; the function is called via the context menu.
GridFox
GridFox is a Firefox extension that overlays a grid on any website. If you can open it in Firefox, you can put a grid on top of it. It's easy to customize and allows you to create the exact grid you based your layout on.

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