This is no reflection on you, SrDriver, but I thought that article was very haphazard in the way it compared the two browsers. For example, simply opening a browser with 15 tabs and comparing the amount of RAM used? Worthless. Now if he had browsed to a series of websites chosen to try and exploit Firefox's memory leaks and done the same with Opera, then compared the RAM usage I would have a little more faith in his results. The feature overview was very lacking, too. Also, comparing Firefox with a bunch of publicly written add-ons using code Mozilla doesn't control vs. an off the shelf Opera is not apples-to-apples.
It's nice to know Opera has a cool new version, too, but I typically expect better quality from CNET.