When your Safari Extension is ready to be released, you can submit it to the Safari Extensions Gallery, and starting this fall, the Mac App Store. Apple reviews all extensions and updates to ensure they work reliably. Before you submit your extension, make sure to read the Review Guidelines for Safari Extensions.
Mac App Store Coming Soon
Safari Extensions Gallery
The gallery is available to all Safari users running Safari 9 or above on macOS Sierra, OS X El Capitan, or Yosemite. Users can access the gallery from within Safari, easily browse extensions, and install them with a single click. You can build compatible Safari Extensions in Safari Extension Builder using your developer certificate. When you submit to the gallery, you will be asked for additional information, including an icon, description, category, and screenshot.