I've been using floorp but the vertical tabs is still quite clunky and it uses a lot of ram on linux compared to windows. So I'll try this right away and update my comment with a review.

Edit 2: I updated my pc and now it's pretty smooth. Will change the update after giving it a bit more time.

Edit 1: ~~I used it and it needs time. Vertical tab is similar to floorp but it's too sensitive on "hover to expand". Webpages seem very laggy and clunky, I have auto scroll on and yet it feels very jittery. Takes less ram compared to floorp(~1gb) with 1tab. Themestore looks good. Overall looks quite modern. Final tldr, needs optimization and not ready for daily drive.~~