This could be very cool if they release it… From their page:

FireCSS is an add-on for Firebug. You edit CSS in Firebug. FireCSS sends the changes to any browser open on that page. When you’re done you can download the modified CSS files.

If your interested in learning more check out this quick demo video and read on.

Status

Right now FireCSS is very incomplete. It works as a proof of concept and I’m pretty confident I can get it to work as a reasonable product. But there’s quite a bit of work to get it there — not much point if I’m the only one whose going to be using it.

Saturday Two for One Deal:
First, is Add N Edit Cookies is a cookie editor that allows you add and edit “session” and saved cookies.

Next, we have CookieSwap, an extension that enables you to maintain numerous sets or “profiles” of cookies that you can quickly swap between while browsing.

Read more…