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Wow! This is the first I heard of this so I looked it up.
According to this article it looks like you need a particular build thats not in the nightly mainline, and its very experimental.
Still, its exciting to see them work on this! I use Tree Style Tabs with custom userchrome.css, but it is a bit fragile. Native vertical tabs would be great!
Hopefully something that gets cut for the final release 😂