Rated 4 out of 5 stars
Very good but do not work on local on domain with port like http://mywebsite.dev:8888/pageThis review is for a previous version of the add-on (0.3.0.1-signed).
Unable to reproduce
What version of Firefox do you use?
What version of Firebug do you use?
What version of Css Usage do you use?
What is your OS?
What is the error you are getting?
What does not work as you expected?