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In Firefox 2.0 a "feature" was introduced that dealt with the edge-case where there were many tabs in a new way. It takes a giant step backward by actively concealing information. Previously, as the number of tabs grew, each one's size would shrink. Eventually, there would be so many tabs that you couldn't even read their titles. But, while this clearly wasn't ideal and led to a certain amount of hunting for tabs, you at least always knew roughly where it was: "an inch or so from the right side of the window". Now, however, the tabs remain mostly readable but can scroll off-screen.