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.
I’ve been using vertical tabs on Firefox with a neat CSS style that makes it look part of the browser in a beautiful way. It was weird at first, especially because I kept dragging my cursor to the top of the browser, searching for the tabs but I eventually got the hang on going to the left. I find it great tbh, can’t go back to horizontal now.