Starting with the latest update I'm going to include proper Releases as well as an usigned XPI file to support Firefoxes new experimental Theme feature. To break it down: You can basically install userChrome-Themes like regular Plugins!

If you're inrerested in this feel free to check out Mozilla's official Documentation as well as the following two issues: #23 here, and #143 over on the FirefoxCSS Store repo. c:

To avoid confusion: The versioning is like this, because I've been tracking it internally, but never bothered by actually versioning the pushes to this repo.