Enhanced Glitch is a extension for Chrome and Firefox that adds in code beautifying and code hinting. (It uses the JS-Beautify and the example CodeMirror code Hinting function which is heavily limited.)
Hopefully the main editor gets these features soon, but if you absolutely need these features (I.E. You are teaching) It’s a simple add-on to get.
I’d be more then happy to add in other “experimental” features to the plugin upon request here or on the GitHub link on the link above.