My Thunderbird said the following this morning: Congratulations! You’ve downloaded or compiled a Daily build of Thunderbird. These are the builds that contain the latest additions and changes to Thunderbird. Earlybird is the place where we stabilise our features before pushing them to our beta users. Experience the newest innovations as they’re developed. I did not deliberately download an Earlybird version and want to use the normal stable build. How can I go back to the normal version?