The Enhanced GitHub Theme for GitHub.com on Safari, but it provides special features for macOS (WIP).
This is the Safari port of Mr Will's Project.
You can get the ZIP file from the release page. Unarchive and place it in the /Applications folder.
Downloading from Mac APP Store is currently not available.
Contributing is always welcomed! You can add localizations and features to the project, or just simply submit an issue!
For the JS/CSS Development, please contribute to MrWillCom/github-enhancing.
Big thanks to the authors of the original project for Chrome and Firefox: