Provided modes are broken under Firefox < 51
The for...of
construct with the const
keyword throws a SyntaxError: missing = in const declaration
in Firefox up to version 51 (upstream bug). This breaks the entire PubSweet app in Firefox. We can work around it by providing our own mode, so this is more of just an FYI.
Note, Firefox 51 is currently set to release at the end of January 2017.