Can the browser/os have an alert for such kind of behavior ? I mean if a script/program is sending repeated/too many requests stop/slow/show users a message ? L

Can the browser/os have an alert for such kind of behavior ? I mean if a script/program is sending repeated/too many requests stop/slow/show users a message ? Like when some javascript scripts is using too much cpu the browsers actually inform the user if he/she wants to stop then ?