Chrome used to be a lot faster years back so I switched. Firefox sadly has never given me a reason to switch back. Chrome is still fast and generally easy to use. (Maybe others here can give me good reasons to switch?)
Chrome also has some obscure features I rely on that Firefox does not have (or just doesn't do well):
* Firefox does not support Touch ID on macOS. I can't actually log into a lot of my sites
* I can't create a desktop app version of a site (Chrome > Tools > Create Shortcut as window). I use this to put google meet, jira, and some other internal tools as dedicated dock apps.
* Chrome lets you run a work and personal profile in different windows. It's just a cmd+` away. It also remembers which profile you had viewed last and opens links in the right one. I didn't like multi-account containers in Firefox because I always had to select the right profile when I click a link.