When Mozilla released Thunderbird 38 (38.0.1) on June 11th one of the new features was being able to use GMail within Thunderbird without having to go into your GMail account and enable the ‘less secure authentication’.  Problem is, how to enable this feature in Thunderbird is poorly documented. After some searching, I found the answer in an unlikely place…the comments on the article from The Mozilla Thunderbird Blog announcing Thunderbird 38: In an existing GMail account, you can switch the “Authentication Method” from “Normal Password” to “Oauth2″ (in both the IMAP and SMTP setup separately). Connection security should be SSL/TLS. If…