Safari is much smoother on my Mac. I was recently running a very compute intensive script. Firefox was dropping frames so badly that the UI became nearly unusable. In contrast, Safari was still a buttery smooth 120fps.

Combine this with the fact that I still get E2EE sync and better integration with my OS, Firefox is no longer tempting to me. And I used to be a Firefox power user for years.

For me, the enhanced plugin ecosystem and additional control that Firefox offers simply isn't worth a slower browser that isn't as well integrated.