It doesn't seem to work - the add-on says "connection ok", but in fact it's not (check your IP)

By Darren Chaker - I have not had any issues using Open in TOR Browser. Thus, far it has not been a problematic option to use while using TOR. Although it is not truly a necessary option, I have not experienced anything other than success while using it.

Funktioniert einwandfrei!