Show me all the existing CSS (with syntax-highlighting) in an editor in a sidebar. Let me modify that or add to it, then share the result. Also, highlight new or modified code somehow. Basically, a save-able, shareable, Firebug editor with diffs.
I like the simplicity though. No need to make it busy and bloated. Most browsers already have a Firebug or something on them already (or you can add them yourself). No reason to have two.
I agree that there isn't a need to reinvent the wheel, but using it I find myself wanting some firebug-esq capabilities. I ended up just firing up inspector in Chrome, but there may be an opportunity here.
Or integrating something like that could ruin the simplicity of the app.
Show me all the existing CSS (with syntax-highlighting) in an editor in a sidebar. Let me modify that or add to it, then share the result. Also, highlight new or modified code somehow. Basically, a save-able, shareable, Firebug editor with diffs.