Use FF70+ on Mac (or also windows?) conflicts with placeholder texts

Summary

If you se FF70+ on Mac (or also windows?) conflicts with placeholder texts, when the username / password is stored in FF.

Steps to reproduce

1. Use Firefox 70+
2. Login into typo3.org or my.typo3.org
3. store the password
4. Log Out
5. open the login dialog

Example URL

https://my.typo3.org

What is the current bug behavior?

Placeholder Text is overlaying stored Username / password values

What is the expected correct behavior?

only the placeholder or stored username / password

Acceptence Criterias

• Placeholdertext are not visible, if value of username or password is available

Relevant logs and/or screenshots