This is an unofficial mirror of the excellent http://kathack.com created by Alex Leone, David Nufer and David Truong.
More specifically, the files making up the bookmarklet itself were copied and modified to load from this github repo.
The original bookmarklet doesn't support sites using HTTPS, which now is practically all of them.
Try it out by copying this to your bookmarks:
javascript:var i,s,ss=['https://zimmi.github.io/kathack-mirror/kh.js','https://code.jquery.com/jquery-1.5.1.min.js'];for(i=0;i!=ss.length;i++){s=document.createElement('script');s.src=ss[i];document.body.appendChild(s);}void(0);
Activate it on any site you wish. ...Except for the ones that have an effective Content Security Policy that blocks inline scripts, like GitHub.
All credit goes to the original authors!
Copyright Alex Leone, David Nufer, David Truong, 2011-03-11. kathack.com