(OP here) It's certainly not "crucial" - but it's a lot easier to trick someone by exploiting their brain's heuristics. Phone vibrating means alert. I think

(OP here) It's certainly not "crucial" - but it's a lot easier to trick someone by exploiting their brain's heuristics. Phone vibrating means alert. I think that could be enough to trick people into overlooking elements like the title bar being visible, etc. For example, I've noticed that some dodgy web adverts play the default Windows Error.wav when displaying a fake "Your codecs need updating" error dialogue. Not crucial, but adds credence. I agree that the browser hacking is unlikely and probably shouldn't be mentioned.