Firefox is a great browser. I recommend it to all my friends and customers. (sometimes I recommend it repeatedly when they don't listen) Surfing the web shouldn't be risky business, but with all the deceitful practices online, it pays to be safe.
Simply playing the numbers proves that over 90 percent of web traffic is related to Internet Explorer. Targeting only this one group would contribute to a substantial return. Simply not being in this group would help significantly. In addition, Firefox actually provides security and doesn't automatically install everything mischievous websites might ask it to. There are even little security enhancements that you may easily install to block even more potentially bad items.