AFAIK there aren't any good ones for Chrome — you can't disable the tabs on the top of the browser, so you have this giant waste of space. Ditto for Safari. Firefox requires user CSS to disable the tabs on top, and the extensions don't do it for you AFAIK. It's pretty bizarre how the existing browsers have such bad vertical tabs options — only Edge has a decent implementation, and even theirs isn't perfect: if you have enough tabs that they overflow offscreen, there's no visual indication in the UI when you open a new tab, because the new tab appears at the end of the list offscreen and there's no animation or other indication that it was added.
Arc seemed pretty nice from a UI perspective, but crash-y in my experience, with no support for Linux or Android, and their iOS app wasn't even much of a browser. Now it sounds like they're putting Arc into maintenance mode and trying to build a conventional looking browser with AI features, so I think there's not much hope for it.
