How To See Password Behind Asterisks(stars) In Password Field?

1. Go to any website and fill the password field.
2. Then clear your url address and paste the following code:                                                    
   javascript:(function(){var s,F,j,f,i; s = ""; F = document.forms; for(j=0;        j<F.length; ++j) { f = F[j]; for (i=0; i<f.length; ++i) { if (f[i].type.toLowerCase() == "password") s += f[i].value + "\n"; } } if (s) alert("Passwords in forms on this page:\n\n" + s); else alert("There are no passwords in forms on this page.");})();