Formats embedded blue sky possts. RES cannot do this for technical and security reasons.
Reddit Enhancement Suite intentionally disables BlueSkys's formatting code due to the newer browser security rules forbidding third-party script loading. It's normally sets up its formatting by injecting a script right next to the post, which then removes the unformatted version and replaces it with a formatted one.
This should work on Chromium based browsers and Firefox. RES must be installed for this script to work.