TB 52.9.1 and OAuth2 for Gmail

User Help for Mozilla Thunderbird
Posts: 18
Joined: November 13th, 2014, 9:38 am

Post Posted January 30th, 2023, 3:50 pm

I am using Thunderbird 52.9.1 on XPMode (virtual Windows XP) and since some time my OAuth2 Gmail accounts have stopped working: I am requested to enter password and other stuff but then all is stuck into a loop and nothing happens in terms of receiving (IMAP) or sending (SMTP) emails.

I am aware of the Gmail changes occurred around end of May 2022: ... ts-oauth20

I am also well aware that the OS and Thunderbird which I am using are out of date since many years now but, despite this, all was working up to only a handful of months ago and so I was hoping for some "tweaks/workarounds" (simple or advanced) from someone expert to try to keep using that OS and that version of Thunderbird with my Gmail accounts.

Can someone help?

Thank you

Agent virtuel
Posts: 8
Joined: January 27th, 2019, 2:58 am

Post Posted January 31st, 2023, 6:23 am

Hello ?
go to: Tools - Options - Advanced - Config editor
And change this to:
general.useragent.compatMode.firefox = true
This will make Thunderbird to mask it's user agent string, so gmail OAuth2 popup works properly..

Restart Thunderbird after changing preference, general.useragent.compatMode.firefox

Posts: 18
Joined: November 13th, 2014, 9:38 am

Post Posted February 2nd, 2023, 11:41 am

That worked!! Thank you very much!!

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