brackets-csscomb
Compatible with Sprint 22 and above
Sorts css files with csscomb.js
Usage
Select css to sort and press Ctrl + Shift + C or select Edit > Sort with CSScomb in menu.
Installation
File > Extension Manager > Install from URL
Paste https://github.com/i-akhmadullin/brackets-csscomb into Extension URL field
Manual Installation
Download zip and extract into arbitrary directory (or clone source files), then move the folder to the extensions folder (you can open this folder by clicking "Help > Show Extensions Folder" menu).