Use env in the shebang of the start script
Using /usr/bin/env bash instead of /bin/bash in the shebang line of the start script improves portability to some Unix-derivates (e.g. BSDs where the bash is usually in /usr/local/bin/bash). However, there are also systems where env is not in /usr/bin/env but in /bin/env, so its a tradeoff.
As I know, tor browser is not running on BSDs so far, but hopefully it will sooner or later and then the shebang will be an issue.
Thanks, for your great work!