Sieberry, it’s what Mozilla is unable to do, nice looking and working vertical tabs.
Simple Translate is nice too just mark a text and instant translation.
I still don’t care about cookies, yeah just leave me alone.
Scroll everywhere, right Click to scroll any page. Should be vanilla feature.
Keepa, for amazon price history of any product.
Not yet. I use my own carefully adjusted Firefox CSS, so I don’t want to mess with it right now.