Why would you do it for every tab switch? You do it once to fit your preferred width and all websites adjust. You would probably have a shortcut for that in your window manager.
There was a great time at some point in the past where everyone went all in on responsive design and most websites behaved well, what we have nowadays is a regression in usability (at least for power users).
There was a great time at some point in the past where everyone went all in on responsive design and most websites behaved well, what we have nowadays is a regression in usability (at least for power users).