Dev 80.0.320.4 - Developer Console > Sources > Page > open any *.js file -> No Syntax Highlighting!!

.js file syntax highlighting is broken since last updates in

• Version 80.0.320.4 (Official build) Dev (64-bit) (mac OS)
• Version 80.0.326.0 (Official build) canary (64-bit) (Windows 10)

This has rendered me almost blind. It works for <scripts>s embedded in .html files but not for .js files.