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Microsoft Edge, anyone?
(sh.itjust.works)
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It has a really good implementation of vertical tabs. Vivaldi and Firefox are somewhat close, but they're not nearly as polished.
Compared to sidebery plugin (ff)?
It doesn’t do as many extra features that I don’t use, but for tabs and tab groups I prefer the Edge ones and grudgingly use Sidebery.
I hate the Firefox sidebar for most things anyway.
Dragging tabs around and to new windows is much less seamless, the having it contract and automatically expand on hover is much harder (userChrome.css hacks compared to a single button), and it requires a CSS hack to remove the horizontal tab bar. I use Tab Center Reborn myself, but Edge does it better than anything I've used.
Brave has the closest comparison I’ve seen, they just don’t do auto hiding.