Apple disabled Flash for "security reasons." You can certainly read in politics, but the reason they gave was that it was the #1 attack vector on Macs and they had no way of securing it. And more importantly, nearly everybody else was on Apple's side in this fight. Other browser makers had problems with Flash too. Mac users largely hated Flash because it had terrible performance on that platform. Even Adobe was cooling off toward Flash as it became more and more clear that it wouldn't work on mobile platforms.

Mozilla's position here is not at all similar to Apple's position then, so their options are not the same.