Earlier quoted context omitted.
They only had two small websites for me. Great success! I'll share my strategy. On desktop: Banking: Vivaldi Browser w/ privacy badger and ublock origin Email and Commerce: Chrome Browser w/ privacy badger and ublock origin News and other BS (like Hacker News): Firefox browser, always in private mode w/ privacy badger and ublock origin LinkedIn (in the rare case I use it): Internet Explorer Mobile: Facebook: Opera Co…
I also had only 2 sites/apps. One I used Facebook oauth, the other I'm not 100% sure what it was. My strategy (Desktop & Mobile): Firefox + Facebook Container & uBlock Origin & Privacy Badger & DDG as search.
I use Firefox + FB container + uBlock Origin + Privacy Badger and recently started to use CanvasBlocker as well. I have Firefox configured to delete all cookies on closing (except for few sites to avoid the need to enter the 2FA code every time I log in).
I've also set Firefox Enhanced Tracking Protection to "Custom mode" with "cross-site and social media trackers" blocked [1] and to use block list "level 2".
I also have the "Do Not Track" option switched on.
I don't have a proper smartphone (never owned one), just KaiOS-powered dumb-phone on which I use Facebook mobile (i.e. their web site) all the time.
Also no Pi-Hole or similar stuff.
I use a throwaway email account for Facebook.
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[1] Just now I've found out that there seems to be a new option, to disable "all cookies from unvisited sites", which I'm going to try as it looks even better.