Why I don't like this kind of solution (yet):<p>I like to mess around in my CSS loads, trying different combinations, <i>trying whether a property has an actual effect on the appearance/flow of the page</i>, etc.<p>I like to then make changes that have been throughly tested inside vim, :w, CMD-TAB, CMD-SHIFT-R.<p>By separating experimentation and editing, I know exactly what is added to my CSS, without having to think about whether or not all in-browser changes are truly necessary for my purpose. I bet use of these kinds of extensions by inexperienced web-designers (togglers we might call them) will lead to extremely ugly and bloated stylesheets.