Code

javascript:var num=prompt("History flood amount: "); done = false; x = window.location.href; for (var i=1; i<=num; i++) {history.pushState(0, 0, i==num?x:i.toString()); if(i==num){done=true}}if(done===true){alert("History flood successful! "+window.location.href+" now appears in your history "+num+(num==1?" time.":" times. (Made by Emaz)"))} 

Make sure to re-type javascript: since when you paste it inside the search bar it does not save, so make sure to re=type it.