This is a Javscript bookmarklet. This shell really helps in trying to debug runtime values.
I did not write this! Source: http://www.squarefree.com/shell/
(This is a very long line! Create a new bookmark and paste this as the target url. Will not work for explorer but great in firefox.)
Code: (JS shell 1.4)
javascript:with(window.open("","_blank","width="+screen.width*.6+",left="+screen.width*.35+",height="+screen.height*.9+",resizable,scrollbars=yes")){document.write("\n\n\n