As an avid Vivaldi user, I was impressed with what Firefox Quantum had to offer. I hadn't used Firefox since Chrome became dominant, it was interesting to see what Firefox had to offer compared to the Chromium-based ecosystem.

Personally, I would consider Firefox Quantum to be a step up over Chrome, but it's still missing much of the customization that I grew to love under Vivaldi. Simply being unable to change keybindings or the speed dial selection were enough to draw me back to Vivaldi, but I'll be keeping a keen eye on Firefox development from now on.

I do agree however, the lack of syncing is a major drawback to Vivaldi, and one I hope they will add in the near future.