checkout this thread from Mozilla website
if you look at the image at, https://ibb.co/fGMhMJ , it shows the sweet alert pop-up saying "operation successful". The other pop-up that is titled "Confirm Password Change", and subtitled, "Select which login to update", is the one that I am talking about. I don't know what triggers this pop-up, but it seems unnecessary and that is the one I think should be suppressed. Sweet Alert has already confirmed successful operation, so no need for that other one.
For the login system, I get the sweet alert, as well as a windows "confirm password change" pop-up box, which seems unnecessary. How do I suppress it? See image link below: