Rated 5 out of 5 stars

Could please make your tool work with code like
"scrollbar thumb { background: #fff !important; }" ?
And add the ability to backup the codes with firefox sync feature?
Apart from that its a very useful addon that combines Stylish and Stylish custom and works even better.

This review is for a previous version of the add-on (0.9.1-signed). 

Done in version 1.0