Well, using Google docs/sheets the difference is really big. I understand that Chrome should be heavily optimised to use other Google products like Google Sheets, but in the end, as a user it really makes a diference.

On a Macbook Pro from 2015, entering a simple Google Sheets documents and have the page fully loaded and ready to work takes me ~8 seconds on Chromium, but ~17 seconds on Firefox. It's really a huge diference.

Still, I'm trying to use Firefox more and more because of privacy considerations, but Mozilla really should up their game and have more focus in their roadmap.