I'm a fan of tree-style tabs for firefox. Child descendants can be collapsed and you can re-arrange the hierarchy as you open/close tabs. It's a little finick

I'm a fan of tree-style tabs for firefox. Child descendants can be collapsed and you can re-arrange the hierarchy as you open/close tabs. It's a little finicky with drag/drop but is very powerful. Edge has vertical tabs which is space saving but lacks a hierarchy which is important to me.