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Mozilla is adding tab grouping, vertical tabs, profile management, and local AI features to Firefox
(connect.mozilla.org)
This is a most excellent place for technology news and articles.
Its honestly the only reason i use brave and edge over Firefox. Can fully commit to FF now.
The TreeStyleTab extension for Firefox has added vertical tabs for a decade
The way tree style tabs worked after they broke it was never very good. Floorp is what to use if you wanted side tabs on Firefox.
That said I still went back to Vivaldi after trying to use Floorp because of stupid little ux issues like pinned tabs not being protected from closing, and broken session saving.
Sidebery is a very good implementation of the vertical tab panel
The issue is that because they broke the UI customization that allowed for it all the extensions are just a kludge to add a panel to the side without actually getting rid of the top tabs.