Firefox developer tools adding a new rule?
I decided to try out the built in Firefox Developer Tools. Seems to be nice, but... I can't find out how to add a new rule to the CSS from Inspector/Rules. By that I mean ".my-new-rule" not just the "element" rule that is open by default. FINAL EDIT: This is now possible with the latest Firefox update. Update: As of FF 33.00 it is now possible to add new CSS rules using the inspector! It is not possible to use the inspector to create new CSS rules with out a browser add-on (see comment below). Just use the style editor. Type anywhere to make a new rule: As of Firefox 33 (in nightly right now