Not really! Snap! is going to support WebSerial, which works only on Chrome, but that doesn't mean it will become more Chrome-centered or run faster on Chrome. Hopefully, Firefox will eventually realize that serial devices pose less privacy issues than webcams or microphones and give in to implementing WebSerial too.
I exclusively use Firefox (like everybody should, unless they want the whole Web to be shaped by EvilCorp in 2 years time), and Snap! runs perfectly fine in it, as does the rest of the Internet save for WebSerial 