Launch torbrowsers on the same host from different users
From Debian bug: https://bugs.debian.org/860297
The problem is not, to run multiple Tor Browsers as the same user, but to run multiple Tor Browsers, each from a different user at the same time on the same machine.
After investigation I found, that this is because of a fixed SOCKSPORT and and fixed CONTROLPORT. But each user needs his own SOCKSPORT and CONTROLPORT.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information