Rated 5 out of 5 stars
More convenient then userContent.css userChrome.css, since you do not need to restart the program to see the effects.
Is there a reason why IceWeasel is not supported?
I tried to override this behaviour through editing the install.rdf but I lack the <em:id> for IceWeasel. Why is it such a pain in the ass, to make things work.
In order to succed registering to addons.mozilla.org, I had to completely deactive noscript, for example.
Anyway, please add support for IceWeasel.