Rated 4 out of 5 stars
First, congratulations for your work. I think we should not forget the work and enthusiasm there is behind an add-on.
Congratulations, but less jubilations : I've always had third party cookies disabled, for years & years, IE as well as Fx, and never had a single issue (perhaps one in fact). There is no reason to accept third party cookies and, should the obligation occur, I truly advise to abandon a site requiring it.