The fix is minimal and self-contained ( https:/ /hg.mozilla. Low, as this is an official upstream point release that addresses only this regression (see https:/ /US/thunderbird/ 60.9.1/ releasenotes/). Instead it fails to authenticate and displays the authentication pop up again. After filling this in and authorizing thunderbird to access your e-mails, your account should be set up and thunderbird should start fetching e-mails from your inbox. Thunderbird should auto-detect all the relevant parameters, and then an external webview should pop up to prompt for your e-mail address (it's not auto-filled, that's a separate issue that's also known upstream) and your password. In a clean environment, launch thunderbird and add an existing gmail account. This has been fixed upstream and is tracked by https:/ /bugzilla. A recent server-side change with google e-mail accounts (gmail) means that thunderbird consistently fails to authenticate, prompting for the user's e-mail address and password over and over, without ever succeeding.

Thunderbird oauth2 gmail