Probably, you could use qemu - virtual machine on *BSD.
Inside it, you could simply run LiveCD Linux, for example Kali-Linux. Thereafter, you might mount host / or / visit torproject.org to fetch fresh TorBrowser. Unzip it,... launch,... voila!
Otherwise, your profile will be highly divided from major mass of TorBrowser's users.
From the other side, they will be able only see, that you are on *BSD and using default firefox via socks5 of source-builded tor-daemon. Plus Width and Height of your Monitor.... Not so bad, it is not your home address... It is something, that shall be changed in half of year anyway, because of simple system's / browser's updates / upgrades. Plus, you will probably, someday, bough yourself another monitor.
In other word, if u are looking to only bypass unfriendly fascist firewall in your beautiful country, you could use any browser via socks5 of default Tor daemon or even just use DigitalOcean to setup openvpn server for yourself.