I already use Firefox for browsing normally, but I have to test on a Chromium based browser too. One soft requirement is that it should be installable with Flatpak on Linux.
I've just been using Edge when Firefox wont open a site. It's installed by default and it's just Chrome under the hood so it works. Plus, after Google's new hostility to ad blocking I refuse to use any Chrome based browser as my default so one is as good as the other to me. They're all just a temporary tool until I go back to using the only real web browser that I can, Mozilla Firefox.