There is even a Hacks article about that https://hacks.mozilla.org/2014/02/live-editing-sass-and-less-in-the-firefox-developer-tools/ https://hacks.mozilla.org/

There is even a Hacks article about that https://hacks.mozilla.org/2014/02/live-editing-sass-and-less-in-the-firefox-developer-tools/ https://hacks.mozilla.org/2014/02/live-editing-sass-and-less...