The thing is, I just use my phone normally. I don't try to find any websites which will crash....and the damn things still crash :-/
I also get FREQUENT page hangs, where a website will start loading and the blue progress bar will get 1/8th of the way across....and just stick there. Only force-closing the app will cure this.
iOS7 is buggy as hell, and also very revealing of a lack of RAM.