As you’ll see, there are several security-related changes including secure context requirements along with the first round of the Symantec certificate distrust actions. If you have a SSL/TLS server certificate with the GeoTrust, RapidSSL, Symantec, Thawte or Verisign brand, take an immediate action to avoid Insecure Connection error pages on your site. Don’t have any certificate yet? Get yours from Let’s Encrypt today, for free.
Array.prototype.values() being re-enabled with Firefox 60 was an example of how adding a new feature could break existing web apps, and it’s not new or the last —
Array.prototype.find() added with Firefox 25 broke sites using the Sugar library, while
Array.prototype.flatten() being implemented is known to affect MooTools which actually had the same issue with