It's the third only if you compare to Chrome experimental APIs, that Firefox devs feel pressured to implement too. When people say it's the new IE they are not saying it's IE6 in 2010, but it's IE6 in early 00's. Google thanks to their monopoly on the web as a platform (except for an iOS anomaly in some parts of the US) is now at the extinguish part of the MS playbook (https://en.wikipedia.org/wiki/Embrace,_extend,_and_extinguis...).