I’ve been using vertical tabs for a while now. It rearranges your address bar and that’s going to take some time and annoyance to sort out, but I’ve got it back to where I like it.

Vertical tabs aren’t as great as they would have been ten years ago. So many websites nowadays use a two- or three-column layout to use the excess horizontal space on a normal screen, and having the vertical tabs showing full length often compresses those. Thankfully there’s a button to switch between full-length tabs and just the favicon for those sites.