Firebug “on demand” – for IE / Opera etc
Paste the following in the address bar:
javascript:var firebug=document.createElement('script');firebug.setAttribute('src','https://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js');document.body.appendChild(firebug);(function(){if(window.firebug.version){firebug.init();}else{setTimeout(arguments.callee);}})();void(firebug);