Build 2178 on Ubuntu
.jsonify is a file extension for a Ruby on Rails gem. If I try to "Open all with current extension as..." to set it to Ruby on Rails, the syntax highlighting remains Plain Text and the jsonify extension is not added to the Ruby on Rails settings file (Ruby on Rails.sublime-settings).
If I manually add jsonify to the settings file, restart sublime, and close and reopen the file, the syntax highlighting does take effect.
Also, it would be nice if I didn't have to restart sublime and reopen the file for the syntax highlighting to take effect, but that's just icing on the cake.