Soon after publishing the chromium/chrome extension that allows you to edit Debian online, Moez Bouhlel sent a pull request to the extension's git repository: all the changes needed to make a firefox extension!
After another session of browser extensions discovery, I merged the commits and generated the xpi. So now you can go download the Debian online editing firefox extension and hack the world, the Debian world.
Install it and start contributing to Debian from your browser. There's no excuse now.