I just switched back to Chrome last night, after about 10 months on Firefox (on Mac). The only reason I switched to Firefox is because Chrome started showing these little blue notification dots on pinned tabs, and these were really distracting. Firefox had them too, but I figured out how to hack them away with CSS.
I found out that these dots disappeared after Chrome redesigned their tabs, so I switched back.
Chrome feels much faster and nicer to use. Firefox would often get really slow and start freezing. The Firefox dev tools were often really slow and unresponsive. If I was working on a big React app the devtools UI would often just disappear and freeze for 10-15 seconds. I think it was known issue related to source maps. My workaround was to close the developer tools before I refreshed the page, and then reopen them. So I'm glad I don't have to do that anymore.
I really missed Chromecast support. If I ever wanted to watch a video on my TV, I would have to pick up my phone and open the YouTube app, or just open Chrome and paste in the URL.
I had to open Chrome every time I had a Google Meet call. Clearbit only provides a Chrome extension and doesn't support Firefox (but that's a problem with Clearbit. They really need to add support for Firefox.)
I liked Firefox's "Multi-Account Containers". It was nice that I could sign into multiple accounts at the same time, and have all the tabs in the same window. Chrome has profiles but they can only open in a new window. (But that works fine.)
One other advantage of Firefox: It kind of lags behind Chrome in some ways, so if your website works in Firefox, it almost always works in Chrome. When I was only developing and testing in Chrome, I would occasionally get an error report from a Firefox user. That never happened while I was using Firefox. Now that I'm back on Chrome, I'll need to be more careful about cross-browser testing.