I also make _heavy_ use of containers with firefox. I have containers for everything from clients to banking to gaming. I even have a 'low sec' container with no ad-block or privacy extensions.
[0] - https://help.opera.com/en/latest/shortcuts/#mouseGestures
At this point I can only hope that google docs, onedrive, and other bloated webapps get optimized to run on other browsers. I'm not holding my breath.
Brave: Research and secondary social media.
Firefox: Used as dedicated threema client.
Opera: if I need a quick VPN or to bypass my pi-hole.