What if I did (understand)? What if I knew a thing or two about it, even some lesser known details and side-effects? Maybe including a controversy or two, or at least an odd limitation and potential hazard at that. But, you correctly do point out that Firefox isn't to blame for implementing somebody else's "standard". Responsible for any and all consequences? Nonetheless, certainly yes.
Aside from now probably not being the best of times for Firefox, my main (potential) concern still stands. However, it is hardly a Firefox-only one, I'll give it that.