"We need a way to organize browsing, to see all of our tabs at once, and focus on the task at hand. In short, we need a way to get back control of our online lives." Will power? Priorities? Reducing friction or eliminating annoyances is not always a good thing, and may not accomplish what you want. Worse, it may give you undesirable side-effects. For example, people complain about freeway traffic, how it takes too lo…
Too many tabs has never been an issue for me. Can anyone actually read more than one tab at once? If you're thinking of buying a DSLR, then focus on researching cameras. Close those tabs when you're done. Exercise restraint, guys. Tab grouping is the classic engineer's solution to a non-problem.
People's browsing habits differ. Some of us do use multiple windows and tabs so we can switch our focus away from a task and return to it later. Mozilla's user studies and large-scale data mining through Test Pilot bear this out, e.g. http://surfmind.com/muzings/?p=505 - among other things, that analysis of several thousand Firefox users found that tab opening/closing behavior among the participants followed a bimodal distribution.