I think Mozilla are absolutely right. and there is no hypocrisy. Microsoft are willing to, and have actually already, cause years of stagnation and harm to the internet with IE6. Presumably if they got the chance they would do it again on tablet too. Apple on the other hand don't appear so risky for two reasons:
1) they've never appeared to have an issue with other browsers on Mac OS
2) there's Android and its browser competing with iOS, so there is not a complete iOS-only monoculture like Microsoft had with Windows - there is still competition between mobile browsers (yes, switching browsers means you have to switch device, but that's better than nothing and will surely prevent one mobile browser from stagnating for five years).
I know this doesn't mean Apple wouldn't do it if they had the chance, but as another commenter pointed out, many people have bad memories of long weekends trying to work with IE6 for the long 5 years between IE6 and IE7. Microsoft have already offended, so they deserve extra special attention, especially with legal agreements possibly still in place due to the antitrust cases.
1) they've never appeared to have an issue with other browsers on Mac OS
2) there's Android and its browser competing with iOS, so there is not a complete iOS-only monoculture like Microsoft had with Windows - there is still competition between mobile browsers (yes, switching browsers means you have to switch device, but that's better than nothing and will surely prevent one mobile browser from stagnating for five years).
I know this doesn't mean Apple wouldn't do it if they had the chance, but as another commenter pointed out, many people have bad memories of long weekends trying to work with IE6 for the long 5 years between IE6 and IE7. Microsoft have already offended, so they deserve extra special attention, especially with legal agreements possibly still in place due to the antitrust cases.