@entr0py. i meant i was curious as to why it was hard coded into torbirdy. in tor browser, if one wants to block all cookies, the option is there.
regardless, this may be moot for the moment. the eff is recomending everyone to immediately cease using a thunderbird + enigmail set up due to a yet to be published vulnerability that exposes encrypted email.
edit: already being called fud. Efail or OpenPGP is safer than S/MIME