I thought that was an interesting choice for Mozilla, too. Here is what appears to be the bug report which contains their debate on whether or not to use codem

I thought that was an interesting choice for Mozilla, too. Here is what appears to be the bug report which contains their debate on whether or not to use codemirror. https://bugzilla.mozilla.org/show_bug.cgi?id=816756 https://bugzilla.mozilla.org/show_bug.cgi?id=816756 I would be curious to know if Mozilla is still actively involved with Ace development at this point?