Seems to be much ado about nothing currently. Even in the release notes it clarified that this feature is not yet included and the quarantine list will be shared once ready (and will at first be mostly test domains). The blog seems to be wildly speculating on its intended use and possible impacts given the knowledge currently available

The major problem here is that they already somewhat revealed this "feature" but keep details hidden as if they were "top secret".

This will now get "shit talked" to the sky and beyond and all that Mozilla had to do to prevent this is adding one or two sentences why this feature is good for their users.

I was also a little concerned when I saw this in the release notes earlier today. Why not make this opt-in (with a warning explaining the reasoning behind it) rather than opt-out via about:config?!

Doesn't look all that silent to me?

does using librefox help circumvent this ? also we got too comfortable with corps . do we need to build our own naviagtor now ?

Won't people just see this error, do a quick search and end up disabling this in the about:config?

Seems like a waste of dev time