I have never understand exactly what it is that people need/desire/require out of Firefox that they find missing but which a Chrome based browser is providing them.
The ability to log into any computer on chrome and load my profile, which gives access to my bookmarks and passwords.
As someone who has 4 chrome profiles due to work remote managing 3 of them that I use daily, Firefox will never be able to handle that.
if Firefox had some sort of cloud sync that wasn’t oh hey you need to have multiple devices to make it work and just gave you a way to do it through the browser properly with even a paid option that would help.