Thank you for keeping in touch. Unfortunately we don't see too much sense of such build:
1. Firefox is slower than than Chrome or Safari (based on webkit) not because of processor optimizations but because of its architecture.
2. It's very hard to update such builds and keep them up-to-date with all official updates.
Nevertheless, SpeedyFox is designed not to be fast, but to be convenient
And SpeedyFox solves some of its disadvantages.