Fix #2160 - Allow Pontoon to run Thimble in an iframe (#2394)
Fix #2160 - Allow Pontoon to run Thimble in an iframe (#2394)


mozilla/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,humphd/thimble.mozilla.org,humphd/thimble.mozilla.org