Comment 6 for bug 1328183

Note that our default UA contains "Ubuntu 14.04 like Android 4.4", so we’re not actually pretending to be Android, just hinting that we have similar capabilities, which leaves the door open to content producers to do a proper detection.

For comparison, Firefox OS chose a deliberately short and clean default UA string (one that doesn’t pretend to be who it isn’t), and they’re having to do a lot of (largely volunteer) work to try and evangelise major websites to recognize their UA, while at the same time making heavy use of the override mechanism to send a fake UA (that most of the time contains an Android token anyway).