A great power of Firefox are its add-ons, aren't they? Sidebery [1] has been a solid implementation of vertical tabs since a long time ago. Begore that got popular, Tree Style Tabs [2] was also a very comprehensive solution.

But nowadays, vertical tabs are native since Firefox v136 [3][4], so at least for the basics you won't need an add-on.

[1]: https://addons.mozilla.org/firefox/addon/sidebery/

[2]: https://addons.mozilla.org/firefox/addon/tree-style-tab/

[3]: https://news.ycombinator.com/item?id=41192118

[4]: https://news.ycombinator.com/item?id=43254871

Do they support nested tabs? Makes visually navigating many tabs so much easier that way.

Unfortunately not, but it does support tab grouping which I use for basically this reason.Althought you can't do a group within a group.

Not yet but it's in development (I'm a product designer at Brave). We're working through other issues with vertical tabs before we continue work on this :)

https://github.com/brave/brave-browser/issues/44345

It does not actually support hierarchical ("tree") tabs natively yet though. They have a placeholder switch for it in the settings.

Not yet but it's in development (I'm a product designer at Brave). We're working through other issues with vertical tabs before we continue work on this :) https://github.com/brave/brave-browser/issues/44345

Firefox has vertical tabs...

That's the only reason I use FF, plus the better adblocker support over Chrome and maybe some of the advanced network privacy stuff.

Adblocker support, in chrome? Does that exist still (I use FF at home with blockers and vanila chrome without extensions at work).

Yes. They are weaker, but Manifest v3 has been tweaked a good bit since the very initial announcements, and people have figured out ways to compress old-format blocklists into Manifest v3 compatible rulesets that can remain surprisingly extensive. They are weaker than v2 blockers or Brave Shields, without a doubt, but they do still do a decent job.

Firefox 136 supports vertical tabs though