The bookmarklet has this code:
javascript:var s=document.createElement('script');
s.type='text/javascript';
s.src='http://php-experiments-2.glitch.me/jslib/eval2.js';
document.body.appendChild(s);
void(0);
And it’s supposed to get the code from [site]/jslib/eval2.js and run that code on the site but it doesn’t work on other sites other than php-experiments-2.glitch.me.