mozilla/thimble.webmaker.org — pull request #397 by Pomax (2014-03-20 00:29:22+00:00)
Title: adding mapping toggle to settings

this adds a new checkbox for turning on/off mappings between the editor and the preview. It uses the friendlycodes Preference system (which rides on localStorage) to make the settings "persistent" without us actually storing it on the webmaker side.