Germany != the World.
Besides, market share of iOS in Germany is ~32% [1], and Firefox ~17% [2], according to stat counter.
And even those numbers are lower/higher(respectively) than those of countries like USA, UK, Australia, Japan etc...
[1] http://gs.statcounter.com/os-market-share/mobile/germany
[2] http://gs.statcounter.com/browser-market-share/all/germany
Google frequently releases major products without Firefox support, with this only being added months or years later.
This is reality today.