uh, #freebsd, what are you doing? why do you want to delete my favorite web browser during a package upgrade?
thank you for the package locking feature, #freebsd. i mean that sincerely. with firefox locked against removal, i can at least keep working until this is sorted.
the #freebsd folks got on it, & both firefox and thunderbird should be back in the repo soon. thanks, everyone! https://twitter.com/woodsb02/status/1237314591262003201
i was pointed to a mailing list message which explains in detail what broke and how it was fixed: https://lists.freebsd.org/pipermail/freebsd-ports/2020-March/117932.html
now i just wait for a `pkg update && pkg search firefox` to produce the expected result, then i can unlock and upgrade.
and yayness!