It's worthwhile to note that Yandex are, in principle, also a competitor. (They ship their own branded version of Chromium; I'm not sure what level it's built at, whether it's just a different theme and some minor additions, or built from scratch on the Chromium Content API. It is, however, frequently out of date and with known security issues, le sigh…)
I also see FirefoxOS as Mozilla's long-shot hedge against the spectre of walled gardens. With first iOS and then WinRT disallowing third-party browsers, a world dominated by locked-down platforms would be a death sentence for Firefox.
Re:New Search Strategy for Firefox
by venomsnake on Wednesday November 19, 2014 @05:54PM
(#8633224)
I always wondered why no one tried lawsuit on that topic in Europe for iOS devices? It is arguably worse than the IE situation (you used IE just once to get a real browser), but right now Safari is only game in town for no technical reason and everyone is cool with that. No addons, no adblock ...
Also, regarding your comment on FirefoxOS: I don't know where you heard that Mozilla expected to support itself through Firefox OS / Firefox Marketplace revenue, but I never heard anybody claiming this (I work at Mozilla). The main reason to introduce Firefox OS was (and still is) to promote openness on the mobile world (i.e. "wrestle duoplogy from Apple and Google"), just as Mozilla/Phoenix/Firefox was introduced to promote openness on the web (i.e. "wrestle monopoly from Microsoft").
Edit: clarifications.