Mozilla has a huge opportunity with Android tablets if they bring a real desktop-grade version of Firefox to larger screens. Right now, most modern flagship and mid-range tablets are more than capable of handling serious work, but Firefox still feels like an oversized phone app with scaled-down layouts. Releasing a tablet app with a true desktop interface, full multi-window support, full desktop extension support, and the option for top or vertical tabs would definitely change the game.
Power and privacy-conscious users rely heavily on specific add-ons for productivity and security, so giving us access to those same desktop extensions on a tablet would make Firefox the best privacy oriented choices on Android.