Another happy user here - it's the power users chromium fork. Criminally underrated. It's a small Norwegian team with no VC funding and a sustainable business model.
I understand if you want to stick with Firefox, but until Ladybird and co are ready for prime time, I'm sticking with Vivaldi.
This major release bump is a bit disapointing though. Was expecting some more headlining features than just a bit of a UI clean up.