Disable DNT for all Tor Browser users.
https://trac.torproject.org/projects/tor/ticket/26486
I'm using this browser for a long time, and I realized "Tor Browser 7.x does not have DNT enabled".
But I already have this setting in about:config: privacy.donottrackheader.enabled: true
So do consider disabling DNT by browser level(ignore about:config and disable it).