Thunderbird keeps asking me to log in to a Google Calendar account, which we don't want or need. The user (not me, fwiw) stopped using T-Bird to check gmail accounts and removed all of those accounts, there was still a calendar subscription from the gmail account that we're getting prompts for, but I disabled that and then this morning there was another prompt to log in to the google account. I've read a ton of questions including these: https://support.mozilla.org/en-US/questions/1130194 https://support.mozilla.org/en-US/questions/988520 And they all assume that the user wants a Google connection. There's no way to say "no, we don't want a google connection at all"