hi all guys ... I'm experiencing several issues with oauth2 authentication, and I never had any issue before February the 2024 ... at the beginning the only account I have was not working was a microsoft account, so I thought it was "because of microsoft restriction" but now, little by little, all my accounts requiring oauth2 authentication are failing, and I don't know were to check ... I do NOT have any httpd/apache server running on localhost I already tried changing things like general.useragent.compatMode.firefox or network.protocol-handler.warn-external.http network.protocol-handler.warn-external.https I also created another blank profile ... but again ... not way to make it works ... cookies are permitted ... javascript is enabled ... the result is always the same ... a blank page when I try to do any oauth2 authentication ... if I manually copy/paste that link in Firefox/Chrome it perfectly works, so it's not a network connection issue ... from what I can understand, it seems to be related to the "built-in browser" in thunderbird, that for some reason does not work "as expected" ... If I try to click on any link for example in the settings page like the "learn more" link of this option Send web sites a “Do Not Track” signal that you don’t want to be tracked "learn more" thunderbird does NOT show anything ... something is broken, and I can NOT understand what it is ... is there anyone with some good advices? please let me know thanks in advance Stefano