I have finally switched my default browser from "Doesn't Work" (Safari) to "Ugly" (Firefox). Hopefully, it will go well.
There's already wonderful friction with "saved web apps" - when I download a link from Fastmail, it opens in Firefox.
My understanding is that Firefox does not support PWAs? The add-on ecosystem seems rife with scams and abandonware, so I'm not sure where to even begin.
My hope is that the 1password plugin will work, which it doesn't really on Safari.