I understand there are sensitive information like bank account, email address(maybe? if you are important). But most of stuff on your computer is crap for, I'd say, 99% of the users(me included). And for an average user the convenience trumps everything.
All of this is fine if there is a perfect replacement for flash. No, there isn't. I don't like Html5, for one thing it is not as smooth, if you use progress bar to drag and drop, you can feel the difference.
Hence.. I really don't appreciated some security fanatics in mozilla disable flash weeks ago. I appreciate that you assume we are all Hillary Clinton. Really dude, I don't care my computer got hacked, there is all crap on it. Take a look yourself. Now if you excuse me, I'd like to watch some dancing cat.