This site also indicates Firefox Focus has content blocking holes for Google, Microsoft, Twitter, and Yandex.
And on desktop Firefox doesn't do any content protection by default, but even their cookie protection has these same holes (see 'tracking cookie protection' section of https://privacytests.org/).
Similarly, Safari blocks cookies but doesn't do any content blocking, even in private mode.
I think they put these holes in because otherwise they end up having to deal with tons of users complaining they can't sign into outlook/Hotmail etc anymore.
I use O365 for work and I've had to unblock a ton of MS crap in my pihole for stuff to work without VPN (we had serious VPN issues for a while). Microsoft apps are extremely chatty. Tons of requests going to azure, pipe.aria.microsoft.com. Etc. Tens per minute, no kidding.
Nope, none of these have anything to do with logins, i.e., Google ad pixel, Google tag manager, Bing ads, or Yandex ads. We're not talking about the entire domain here, but particular ad scripts -- if you click the name on the page they tell you exactly what path they are referring to.
This site also indicates Firefox Focus has content blocking holes for Google, Microsoft, Twitter, and Yandex.
And on desktop Firefox doesn't do any content protection by default, but even their cookie protection has these same holes (see 'tracking cookie protection' section of https://privacytests.org/).
Similarly, Safari blocks cookies but doesn't do any content blocking, even in private mode.