Well, after months of being available Firefox 3 (Gran Paradiso), I decided to download Firefox 3 beta 5. I started to see some changes and improvements.., the JavaScript implementation, the CSS improvements, DOM Model, memory improvements, etc.

As you can imagine, one of the first things I saw was the javascript and DOM that this version of Firefox is using.

document.addEventListener("click", function() false, true);

or…

let it = (i + 3 for (i in someObj));
 try {
   while (true) {
     document.write(it.next() + "\n");
   }
 } catch (err if err instanceof StopIteration) {
   document.write("End of record.\n");
 }

Also in the DOM now it’s supported the events: oncopy, oncut, onpaste. getElementByClassName() and more.

And finally, CSS has also new things. CSS improvements.

Give it a try.