I really, really want to switch from Vivaldi to Firefox, but I am just too accustomed to the workflow. The interface is too slick and it "just works".

I use vertical tabs with different workspaces, and although I am aware I can do it with extensions or userchrome in Firefox, I've found both variants pretty rough and unpolished -- and I don't have the time and energy to polish stuff that bothers me.

The biggest question for me is why nobody creates browsers based on FF engine and everyone uses chromium as a backbone for the browser. I would love to see something like Vivaldi or nyxt based on FF engine.