[ChrisDutrow]

All your points are great, just offering these counter points for the sake of discussion:

Firefox was slower with the UX animations. It seemed to skip frames/uglify the animations. Though I did not have a lot of problems with bugs that crippled the application. Internet Explorer was mainly the browser with crippling bugs that were sometimes hard to fix.

The counter point to the "carrot" of more users from Firefox is that I'm working with limited resources. I feel like if I hired another developer, one of the things they could start out on is cross-browser compatibility. But right now, in order to get those firefox users, I have to sacrifice somewhere else. I don't think not supporting all major browsers is a good long term strategy, but I think it might be a necessary early-stage strategy.