Firefox is one of the major desktop browsers and it has been slowly trying to capture the mobile market too as most of the people are now using handheld device, but the main problem is that Firefox for mobile only supports ARMv7 handsets as of now, which means that it cannot be run on more than 50% percent of Android devices available in the market right now. But Mozilla has confirmed that they are working a update which will bring ARMv6 handset support to Firefox mobile.
This was much needed and should have been supported from the first itself, this is also where the developers get affected by the fragmentation issue in Android, but it was really surprising to see the developers are acting so late about this problem, anyways it will finally be available soon and we will be looking forward to that day.
Source: Browserfame