Firefile is a Firebug extension that allows you to save the CSS files edited with firebug live to your web server by transfering it to a server- side script, which then handles css saving. FireFile remembers all modifications done to a website (all modified css rules) and allows you to save them directly to your (local or remote) web server, which means that the changes will be publically applied.
How FireFile works
You can download the Firefox- Extension from https://addons.mozilla.org/en-US/firefox/addon/52365/ (Official Mozilla Addon Repository).
You can get the Server- Component from https://github.com/tobiasstrebitzer/FireFile-Server/zipball/master