Once Firefox 38 ESR reaches beta state we should start rebasing our existing patches. This ticket is tracking that progress + the upcoming issues. For reference: * Firefox 38 Beta: 2015-03-31 * Firefox 38 Release (and ESR): 2015-05-12 * Firefox 31 ESR end-of-life: 2015-08-11 See also Mozilla's [Merge/Release schedule](https://www.google.com/calendar/embed?src=mozilla.com_2d37383433353432352d3939%40resource.calendar.google.com) and [Release overview](https://mozorg.cdn.mozilla.net/media/img/firefox/organizations/release-overview-high-res.9808ec366a94.png).