The warning only appears on login forms that are not using HTTPS. This warning does not indicate your password has already been stolen.

If the login page is insecure, check if a secure version exists by adding https:// in front of the website address. You can also contact the website administrator and ask them to secure the connection. Otherwise, it is not recommended that you submit any information through the page.

Use different passwords for less secure sites. Don’t reuse your email, banking, or main account password. Otherwise, it is not recommended that you submit any information through the page.

Insecure connection password warning in Firefox

Hello

For information purposes. Firefox advanced customization and configuration options. https://support.mozilla.org/en-US/kb/firefox-advanced-customization-and-configuration

https://support.mozilla.org/en-US/questions/1507742 If you wish to test a userChrome.css file.