Google announced that future versions of Chrome will label resources delivered via the File Transfer Protocol (FTP) as Not secure The security improvement will be implemented starting with Chrome 63 version that is planned for release in December 2017. Google encouraged developers to follow the example of the linux kernel archives by migrating public-facing downloads from FTP to HTTPS and terminating all FTP services by the end of the year. The FTP usage for top-level navigations was 0.0026% in the last month.”]
Source: https://securityaffairs.co/wordpress/63119/security/chrome-ftp-unsecure.html