Odd behavior with "history.back" in Ember app using "replaceWith" running in iframe in FF


I am having trouble with history.back() in an Ember app running in an iFrame after a transition made using Route#replaceWith, but only in FF. I have posted this issue here: https://github.com/emberjs/ember.js/issues/11318. Any thoughts would be appreciated.

Update: this is not an Ember bug, but rather a Firefox bug. See https://bugzilla.mozilla.org/show_bug.cgi?id=301307.