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Mozilla Firefox is Working on a Tab Grouping Feature
(news.itsfoss.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Please give me vertical tabs to I can switch to FF
Maybe you want to try the Tree Style Tabs or Sideberry extension.
I just use power tabs. gives me vertical, grouping, search, sorting, and some rules behaviour you can do but I don't use that last part.
There are Extensions to do that if you want.
They require a lot of tinkering for a half-arsed result. Built in vertical tabs like in Vivaldi or edge work and feel much better with just a single setting.
There's a fork of Firefox which have this feature in built known as Floorp which I personally use.
Coincidentally, they are working on that too
I think its possible with themes
it is, like with this one or various other themes.
Difference with this one is that it doesn't need an extension like Sidebery