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Impressive HTML source viewer for Firefox

Felix Ritter has written a very useful extension known as View formatted source for Firefox. It gives your some amazing degree on control over HTML source of a webpage like syntax highlighting, expandable tags and even works with CSS, frames and selected text..

Displays formatted and color-coded source and optional CSS information for each element. You can see exactly which CSS rules match for an element. The rules are displayed including file name and line number. The topmost element is that with the highest priority. You can fold/unfold/hilite block elements (table, tr, td, div, span,...).

Link to Download. The HTML Source extension still needs a little bit of tweaking - it crashes Firefox on viewing "selected" source.