View formatted source - Mozilla add-on that allows you to see the formated and color-coded source.
Version: 0.9.5.0Displays formatted and color-coded source and optional CSS information for each element.
Operating System: Mac OS X
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,...). Really cool feature: select a block level element of interest directly in the page and view it's source!
Available in English, German, Danish, Dutch, French, Spanish, Italian and Portuguese.