Good Luck Rated 2 out of 5 stars

This may be the single most important add on for firefox after firebug.
Only that it is not ready yet, it totally broke my css.
What I would love to see is a merge of this and firediff (https://addons.mozilla.org/en-US/firefox/addon/firediff/) - firediff is great because it track specific line changes to your css and gives you a diff format output, the only thing it misses is the apply button which this add-ons perfectly provides.
I don't know how realistic is that but what I'm saying is don't try to reformat the whole style sheet and just apply the changes to the changed lines.
Good luck anyway.

This review is for a previous version of the add-on (0.8.6).