I’m a little surprised the current version of Google Chrome still works on El Capitan. Some developers aren’t careful about making their sites at least minimally usable in older browsers with a definition of “older” being more than one version or more than one year old. The last version of Safari for El Capitan is 11.1.2, which is now three years old.

certificate is issued only for but the site is trying to also use it for If a site loads but looks or acts broken in some way, the developers probably are using newer code features an older browser doesn’t support. You will see the same kind of warning page caused by site-specific problems like certificate expiration or using a certificate that doesn’t include the visited domain name (e.g. When a root certificate expires, any site using a certificate that relies on it will not load in your browser. I wonder if this will help the issues that I’ve previously had with Safari. Safari already does not work on many sites, but Google Chrome does.

Best web browser for mac el capitan