Firefox 4 is doing something similar with its "expose"-like feature for tabs, that lets you group tabs in some way. I too think it's silly, and I wonder if moz

Firefox 4 is doing something similar with its "expose"-like feature for tabs, that lets you group tabs in some way. I too think it's silly, and I wonder if mozilla/opera are just building things because they think they're cool, or if they actually have user studies that show these are useful features. I expect the former.