Untrusted connection visiting http://ift.tt/1tUYWhu

Somebody on Stackoverflow posted some code from http://ift.tt/1tUYWhu

When I click this link in Firefox (36.0) it says "This Connection is Untrusted". But other people on that thread on Stackoverflow say they don't have a problem with the link.

But, apparently, some people, besides me, do have a problem with this link If even Apple cannot properly install certificate

When I check the certificate at http://ift.tt/1EfoETb it says "Certificate does not match name http://ift.tt/WpMlg9"

Why do I get this warning when I visit http://ift.tt/1tUYWhu? Why do some people not get the warning? Is this something I should worry about or can I safely ignore this warning and move on?