Vertical Tabs left or right per window

While I will suggest this tot he team, I think its unlikely that this feature will be added on a “per window” basis. The feature, as I stated in a similar thread recently, to move vertical tabs to the left or right of the window is already in Nightly and will be in the stable build shortly — however, this is done on a per profile basis, not per window basis.

This makes sense, as changes in the Appearance settings (and most other settings) are applied to the profile they’re being changed on, not the individual browser window. As far as I know, no browser allows this type of per window setting natively (there may be an extension that allows this type of functionality but I am familiar with any).