Allow to Enable Vertical Tab Sidebar for Some Windows「Individually」

[jellyterra]

Support Firefox to be able to use different tab view modes on different windows! For example, two Firefox windows on different monitors, in my situation below:

- One on a 1920*1080 hori screen, with vertical tab sidebar disabled

- One on a 1080*1920 vert screen, with vertical tab sidebar enabled for this window only in this case.

Because the horizontal and vertical screen experiences are different, it is very reasonable to make the sidebar selectable by window! 😄

It brings much more convenience, at least for situations just like mine.

Firefox  

[Jon]

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[proxy]

This would be great, features like this is what sets firefox a part from other browsers.