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You can try Vertical Tabs in Firefox now
(www.ghacks.net)
A place to discuss the news and latest developments on the open-source browser Firefox
Not opposed to this, but why do I want this?
I suppose many responsive sites have a maximum content width that is admittedly a lot smaller than many displays these days. I guess this lets you use a couple more pixels of vertical space by trading the wasted horizontal space.
I have a really wide monitor, so I end up with wasted space on the sides of most websites, so vertical tabs lets me maximize my vertical space on the screen.