Rated 5 out of 5 stars

A must have userstyle, an essential piece when you're not conforming with the browser layout or some web page layout... I use it only for the browser. Among its strong points are the agility in testing styles, enabling and disabling them, or simply viewing the effects without installing or before appying the changes you've just made in the editor, that flexibility level is something you're not going to achieve through layout modification extensions; and the fact that you probably can handle all, or most of the addons you are going to use to modify layout from the specialized menu of the userstyles, in the Addon Manager.

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