Mozilla Thunderbird Wrong User Name and password Fix

Hello...

If you trying to login in Mozilla Thunderbird and got a error again "wrong user name and password".  Then first check are you entered your credentials exactly or not.. (99% sure you are typing exactly).

In this case problem with Google security.
For fix this problem :- Login to your gmail account and check your inbox.  There must be a mail from Google Accounts.

It's asking your permission for login less secure apps. Enable this setting, save it and login to thunderbird.

Or just login to Google Accounts first,  enable login for unknown devices and login to thunderbird.

Problem solved..