Changes

| Tab groups are a great feature of Firefox, but it is only half-finished. There's a redesign proposal at http://readyformozilla.com/panorama and a prototype at http://readyformozilla.com/panorama/prototype. The work involves both the finalization of the (currently rough) design and the implementation.

| Knowledge of CSS, Javascript and XUL, as well as an eye for good UI design

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