Firefox still doesn’t have a native vertical tab bar.
That is only mostly true now. There is an about:config setting you can turn on in FF 129 (released this week) which will let you have native vertical tabs. The implementation is only about half done, but it’s good enough for me to use alongside Sidebery Tabs.
You can track progress on vertical tabs in Bugzilla. They are also working on tab groups, but that work is at an earlier stage.
All in all, I think we’ll see vertical tabs in the next 6 months or so? As a devout Firefox user and resister of the Chromium monopoly, I am really excited.
I wish FIDO had paid more attention to SQRL. It’s long in the tooth now, but with some attention it could have been a better solution than passkeys, IMO.