Kevin Gallagher posted his et al.'s paper on Tor Browser UX on the ux list. https://lists.torproject.org/pipermail/ux/2018-September/000427.html
Some user quotations you may appreciate: Several participants perceived using the Tor Browser as a learning experience. For instance, some Tor Browser warnings made them aware of threats to anonymity they had not previously considered, such as HTML5 canvas data, window maximization, etc.
“I really enjoyed that when you resize the Tor window, it notifies you that, while you may choose to do so, it actually makes your device more vulnerable. I had no idea that this was an issue and was very pleased that Tor let me know this.” – (P11, F, unspecified age, write-up)
Similarly, participants found it illuminating to consult the circuit information, which many felt was well-presented and useful.
“One really cool tool that Tor offers is the map of where the IP address is being rerouted — seeing that the circuit is being bounced around back and forth to other countries.” – (P1, M, 22, write-up)
“I loved that I was able to see the circuit that the browsing session was being routed through and how it bounced around different countries.” – (P5, F, 19, write-up)