I
love the way chrome handles tabs, especially the way they shrink. The icon is enough to distinguish it and even if there is no icon for that page you already know its appromixmate position and can quickly find it (which you just can't when everything scrolls and you have no idea where you are).
The firefox tab scroll feature is probably the feature I hate the most, in any browser (yes, you can disable it - but bad defaults stink and you can't just go around and change the settings in everyones browser).
First time I've come across someone that doesn't hate it :o