Figures I found for global share are Android 48%, iOS 20%, Symbian 16%, Blackberry 10% (https://mobiforge.com/research-analysis/2011-handset-and-sma...) which matches my memory of that time much better.
https://www.statista.com/statistics/272698/global-market-sha...
For context, the first stable release of Firefox for Android was made just a few months after Nokia N8 release.
Figures I found for global share are Android 48%, iOS 20%, Symbian 16%, Blackberry 10% (https://mobiforge.com/research-analysis/2011-handset-and-sma...) which matches my memory of that time much better.