My workflow in most projects: 1. create .css file 2. tweak pixel-positions via Firebug and instant preview 3. write final positions into .css file Firebug n

My workflow in most projects: 1. create .css file 2. tweak pixel-positions via Firebug and instant preview 3. write final positions into .css file Firebug nicely display the line number of the css rule to tweak. This isn't possible with something like Sass, so i assume it would slow me down. This instant preview tweaking with Firebug is even more important with legacy CSS to find the position where a certain value is set. I can't think of a way to do that with Sass.