Most days I have only three or four browser tabs open: GMail, Twitter, Google Reader, and whatever link I’ve clicked through from one of the previous three. I know folks, though, who regularly have two dozen or more tabs open. All day. Every day. They struggle to remember which tab has their GMail, only to find no new mail when they get there. Pausing a Last.fm stream requires an inordinate number of clicks. Basically, the proliferation of web-based apps has made the browser an impediment to streamlined productivity.