There is a couple of very useful extension for Firefox to help working with stylesheets in the same time that you are browsing a web page. The fonctionnalities goes from advanced features in some great extensions such the dom browser in Firebug, or extension dedicated for CSS such CSSViwer or Aardvark. Such extensions and others have been developped to provide advanced fonctionnalities to manipulate CSS directly from Firefox.
A friend asked me in a very recent meetup about an extension which could provide easy and fast access to CSS properties of elements as we view a web page, Aardvark could provide a very excellent solution as you glide the mouse over the page, you will see a red rectangle framing each element under the cursor. You will also see a little yellow caption showing the HTML element type and its class or id if they exist. Then if you want to view source of a selected element you can press V from the keyboard. There is many others keystrokes provided with Aardvark which could help considerably playing with elements of a page directly from Firefox.

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