Vertical tabs preview now available in the Canary and Dev channels

William Devereux Feature is great, however, would be great if you could switch the vertical tab line to both the left and right side of the screen - also the collapsable mode still takes a portion of the screen when fully collapsed and seeing that no screen is gained vertically, it would be even better if the collapsable mode would fully disappear and would reappear in its current collapsable state after clicking or hovering over an icon.