Earlier quoted context omitted.
You probably have to restart because the web rendering engine (WebKit) used by your browser (Safari) is used all over the rest of the system as well (in webviews). Just a guess though.
Rings a bell. I seem to remember that someone sometime got into some trouble for something like that. Just a fading memory.
Not sure why people try to apply monopoly restrictions to Apple. They don't have monopoly position (not even close) in any market they operate.