Editing CSS parameters can take the fun out of blogging, especially when you have to edit your settings, reload the page in your browser, edit the CSS, save it again and reload your page AGAIN.
Here as simple and handy tool for FireFox users:
EditCSS 0.2.3, by Pascal Guimier
It allows you to edit your CSS LIVE and you see the changes right now. Once you are finished editing, copy your new CSS and save with your regular editor to your CSS on the server.
IMPORTANT: Just because you edited the CSS in your browser does not mean it's saved on your server! Never forget that.