Which would you rather have: Gecko/Webkit embedded in an Emacs buffer, or an Emacs/Vim buffer embedded in Firefox? I've seen some stabs at both, but neither really Done Right.
Probably the latter. Having Firebug IN the IDE would be invaluable and (r)evolutionary. A lot of the times I 'develop' by writing CSS in Firebug, then copy-and-paste the result into the actual CSS file.
Hm. That means I want a WYSIWYG, actually. Time to fork Firebug?
Yeah that would be great. I haven't found a CSS editor I really like.