It’s not like Firefox doesn’t collect user data at all. Vivaldi is hard to seriously fault in that area.
Unfortunately, Firefox lacks some features that make it a little clumsy at times. But for general use it is great. I keep it installed and use it almost every day because I believe in the browser engine and the need for diversity in that area. It’s just not for every need. At least not for me. That’s where Vivaldi and Edge have to help.
Or simply install a physical button.