Well that’s interesting. I’ve read more than one place the having uBlock Origin is “enough” and that adding Privacy Badger is overkill. I’ve also got AdGuard Home running on a Pi-4. I failed all three tests with Vivaldi Nightly and Arc Browser–both with uBO installed…
Simply adding Privacy Badger to the existing setup, suddenly I had “strong web protection”.
[edit] Firefox passed without having to add Privacy Badger.
Just realized I’ve got a wide selection: Windows, MacOS, Android, and EndevourOS, and Manjaro. (I haven’t booted the Windows box in MONTHS…)