mozilla/gecko-dev — pull request #54 by Gozala (2014-12-31 00:21:26+00:00)
Title: Bug 1116628 - Enable dom.mozBrowserFramesEnabled

Enabling dom.mozBrowserFramesEnabled just for desktop runtime will allow apps that request "browser" permission to use a browser API
https://developer.mozilla.org/en-US/docs/Web/API/Using_the_Browser_API