Opera had side tabs (as far as I remember you could freely choose one edge to display them on). I really miss the old Opera browsing days, it had great function

Opera had side tabs (as far as I remember you could freely choose one edge to display them on). I really miss the old Opera browsing days, it had great functionality such as more keyboard-oriented browsing. E.g. you could bind a key to "fast forward" through pages of a site - it parsed out the paging links to simulate clicks, worked in most forums back in the day.