This is nuts Rated 5 out of 5 stars
I can't tell you how useful this is. If you find yourself tweaking with CSS in Firebug and then copying it all over to your editor (and sometimes getting carried away and doing too much so that you forgot what you edited, like me), this is going to streamline your coding like you won't believe. A tiny hassle to set up. Tiny. You can do it.
This is a donate add-on for sure. (No, I'm not friends with the creator)