add link, update Firefox 32+ and Opera 24+

Opera data from http://www.chromestatus.com/feature/5030265697075200
Firefox data from https://bugzilla.mozilla.org/show_bug.cgi?id=865789 and https://docs.google.com/spreadsheet/ccc?key=0AiAcidBZRLxndE9LWEs2R1oxZ0xidUVoU3FQbFFobkE&usp=sharing#gid=1