Witam Barcel,

This alert is stating that your https connection is not trusted/private. It is either not secure, has mixed content or not secure log-in (log-in data go unencrypted over the wire!).
You could use this new just launched Google extension to be protected for your google.account password security.
Read: https://support.google.com/a/answer/6197508
Download Password Alert here: https://chrome.google.com/webstore/detail/password-alert/noondiphcddnnabmjcihcjfbhfklnnep

pozdrawiam,

polonus