Re:Firefox 23 will block non-SSL content on SSL pages by def...
by ck2 on Tuesday April 09, 2013 @08:43AM
(#5517654)
Unless you are supporting China, IE6 usage is below 1% in virtually all countries: https://news.ycombinator.com/item?id=5511627
http://paulirish.com/2010/the-protocol-relative-url/
Not using protocol relative urls causes a great amount of pain. Unfortunately when you're building content for third party pages you need more graceful degradation than focus stealing dialogues.