It depends on the country. In Germany Firefox is actually the most popular browser according to usage statistics (even ahead of Chrome).
Source: http://de.statista.com/statistik/daten/studie/13007/umfrage/... (German statistics office. Paywalled sadly, but you can see the first paragraph that describes Firefox market share at 52%.)
Just FYI, Statista is a private company. You may be thinking of http://destatis.de/, which is the homepage of the German federal office for statistics.
https://www.w3counter.com/globalstats.php
Last month ff was ahead