Would be useful to have multiple tor instances firejailed providing separate circuits/browsers open simultaneously. When attempting with --private torbrowser I get following:
/usr/bin/env: ‘./Browser/execdesktop’: No such file or directory
Tried whitelisting /usr/bin/env.
--private won't work because TBB is installed in your home directory (which is empty with private)
Consider instead enabling Tor's IsolateDestAddr option.
@Zypherspace see also: https://support.torproject.org/#tbb-36
You could probably adapt my method for creating temporary firefox profiles (see the private-profile.sh script in my repo: https://github.com/chiraag-nataraj/firejail-profiles). I'll give it a go later and post back.
@Zypherspace closing due to a long period of inactivity, if you have future questions, fell free to re-open.