Chrome handles tabs different than FireFox. Each tab in chrome is hosted on separate process; this makes browser stand stable even one of its tabs crash. New Internet Explorer 8 is also handling tabs this way under the hood.
My next observation was on memory consumption comparison between Chrome, IE8, FF3.1 for given same set of web sites.
Chrome used Approx. 62 MB, IE8 Approx. 89 MB, FF31 Approx. 56 MB.
Difference is not big between FF and Chrome, but IE8 needs some more optimization.
The browser war is now much more heated up. Though Microsoft Internet Explorer is controlling 78% of browser market share, it has to struggle more to retain. FireFox is secure, mature, growing and there are clear notion of Chrome becoming one more dominant browser.