about Android: it can't ever be updated
Uhh... yeah... bout that... When an update came out for my phone the update notifier sat in the notification drawer until I successfully updated my phone. Guess it can be updated then, huh?
Yes. Flash has run in a separate process for 5-6 years now IIRC. When Flash crashes, it doesn't take down Firefox, it just displays a block say that Flash crashed, and I believe it gives you a report link.