Sorry I put this post first on Firefox support page, first time here... I am using a account with domain name of my own, However to use Google calendar by mistake I did use my personal Gmail address. I will like to use my professional Gmail account,which is not the same. However when I try to get out of the Google Calendar account, nothing happens. I try to close and reopen, nothing happen. I when to Firefox and open my professional Gmail Calendarhoping they could be synchronise some way but nothing change. At first I was using 52.0 and upgrade at Thunderbird 52.6. Upgrading it destroy my profile.ini, very bad for an update process, but I have always a backup. I put back on appdata/local/thunderbird. But the studpid bird get me back the calendar on same personal address, not asking me to setup it. Then I don't know what to try now. I realy think it is a bug (2 bugs considering that before Thunderbird 52, update did not erase my profile.ini)

Best regards