One think to keep in mind is that firefix is probably a pretty hard target. Everyone wants to try and hack a web browser. One assumes the low hanging fruit is mostly gone.

I think the fact this is even a conversation is pretty impressive.

Probably you're right, but given the browser usage-distribution, I reckon most hackers wouldn't care about firefox at this point and solely concentrate on chrome. I reckon firefox users are on average, more tech savvy and given a hack, would be able to help themselves/find out about the hack quicker than the average chrome user.