You can enable them in about:config if you search vertical.
Edit: to be more specific, the setting is 'sidebar.verticalTabs'
Also sidebar.revamp. It's kinda underwhelming, because as of now sidebar doesn't include tab titles and empty headerbar isn't removed. Hope it's going to be improved in the future
Great, thanks !
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You can enable them in about:config if you search vertical.
Edit: to be more specific, the setting is 'sidebar.verticalTabs'
Also sidebar.revamp. It's kinda underwhelming, because as of now sidebar doesn't include tab titles and empty headerbar isn't removed. Hope it's going to be improved in the future
Great, thanks !