Article No.2482WebBrowser warns of insecure connection when entering access data
Since Firefox version 52 and Chrome version 56, the following note is displayed below input fields for access data on unsecured web pages (HTTP):
"This connection is not secure. Your credentials could fall into the wrong hands on this page."
To prevent the above message from being displayed, a valid SSL certificate should be installed on the Web server. Instructions for the IIS can be found in the Knowledge Base article no. 2190.
If no certificate can be imported, there is the possibility to change a setting in Firefox to suppress the message. Just enter about:config in the address bar of your browser and search for the entry "security.insecure_field_warning.contextual.enabled". Set this entry from "true" to "false". This procedure is NOT to be understood as a recommended solution! This is only a workaround if no certificate can be imported.
Further information can also be found on the following pages:
To Mozilla Firefox: https://blog.mozilla.org/security/2017/01/20/communicating-the-dangers-of-non-secure-http/
Google Chrome: https://developers.google.com/web/updates/2016/10/avoid-not-secure-warn