According to w3counter ff and ie are neck to neck.
https://www.w3counter.com/globalstats.php
Last month ff was ahead
https://www.w3counter.com/globalstats.php
Last month ff was ahead
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%.)