Microsoft left IE6 stagnant. They didn't "abuse their position" other than through inactivity.

Google is actively involved in the standardization process, and moved Youtube over to a new API too prematurely (v0 of a spec). Now that v1 has been standardized, they're updating to that instead.

These are opposite problems. Microsoft got complacent whereas Google moved too fast.

It's more of an OS issue here. Google doesn't view Android as a separate line of business. It's merely a moat for the search business. There's no way for an OS to be a moat for another business without abusing the OS.

Firefox will not, because they don't control youtube or google.com, or facebook or any major website. One of the reasons they are the best.