The solution should arrive in Firefox 45 for Android, currently available in the Play store as Firefox Beta, in the form of a menu button on all devices: https://play.google.com/store/apps/details?id=org.mozilla.firefox_beta I don't know how to transfer settings from the non-beta version to the beta version, but hopefully someone else know the best way. Or if you don't really have any settings to transfer, you could just give it a try.