On Mac Sonoma 14.4, Thunderbird 115.12.2 When I try add my Gmail account or calendar account, the Gmail sign-in prompt page comes up but is entirely blank and does not load. When I restart my laptop I can sometimes get the page to load but when I allow my account to be connected, the next page does not load still. So the authentication process does not finish. The result is the same whether I enter my password on Thunderbird or not. I have uninstalled and reinstalled Thunderbird, and downgraded to an older version. Same issue. I am not sure if it is a Mac issue but I am only having the issue with Thunderbird.