Blocking Pop-Ups in Thunderbird
How to eliminate and permanently block yahoo mail pop ups that appear immediately upon starting Thunderbird and recur after deleting? (Windows 10, Thunderbird 102.10.1)
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See that bit where it says sign in and a big next button. You need to do that.
What you are seeing is a standard sign in for a yahoo mail account. unless you actually complete the login process and allow Thunderbird access to connect to that mail account, you will not see any new activity in that mail account in Thunderbird.