Thanks. Fixed 1. with https://github.com/stevekrouse/hs.js/commit/265c0a6632f793f4..., but not sure why that didn't work in FF.. :\

2. But what should we expand then? Just the first one? Part what makes it interesting is that you can decide for yourself what to expand, and it doesn't matter in which order you do it (Church-Rosser).

3. Feel free to hack CodeMirror or Ace in there! :)