How to parse HTML from JavaScript in Firefox?

Question

What is the best way to parse (get a DOM tree of) a HTML result of XmlHttpRequest in Firefox?

EDIT:

I do not have the DOM tree, I want to acquire i

Answer 1

innerHTML should work just fine, e.g.

// This would be after the Ajax request:
var myHTML = XHR.responseText;
var tempDiv = document.createElement('div');
tempDiv.innerHTML = myHTML.replace(//g, '');

// tempDiv now has a DOM structure:
tempDiv.childNodes;
tempDiv.getElementsByTagName('a'); // etc. etc.