Can't add email address to contact from account page

If you try to add email address to contact from account page, it is not possible to add email

I can’t reproduce this bug, please look at the browsers console for error messages, if there is nothing, look in your php log or sugarcrm log files for futher error informations.

I have this problem only in Mozilla. With Edge I do not have this problem

Nevals, we definitely can’t find any way to reproduce the problem with mozilla Firefox.
Do you still have the problem when developer mode is turned on?
Administration > System Settings > Panel advanced => check developer mode

No, same thing also when I turned on developer mode