I’m trying to switch to Floorp right now from Firefox, where I have both the regular horizontal tabs, and a flat vertical list with the Tree Style Tab extension. I use the later a lot, and while I could keep this setup in Floorp, I like that the vertical tabs can be native instead of using TST. However, it just feels weird to not have horizontal tabs. I think I might miss seeing a bunch of my tab titles at a glance with it, but I have to use it more and see how I feel.
Vertical tabs via extension and userchrome mods in Firefox sadly don’t have the polish compared to MS Edge or Vivaldi.
It’s fine, but I find it clashing with the browser history sidebar, and being tuned off by default in private tabs.
It can come close, but until (if ever) official support will be provided, It’ll always feel like a bandaid fix to me.
For that reason I keep both vertical and horizontal tabs enabled. On other browsers with native support I never missed them, in Firefox however I need both. Relying on sidebar-powered vertical tabs alone is not a good User experience.