Even simple things go wrong already: The programmers made a conscious choice to be as little helpful with their documentation as possible. Proof: Instead of mentioning to click "Thunderbird Main Menu / File / New / Bitmask account" to start the BITMASK wizard add-on, they dump all sorts of unwarranted info on the unsuspecting user. Don't bother to change your ways, guys! Keep making bitmask a project that frustrates everyone.
This review is for a previous version of the add-on (0.0.6).