> So, the question can be rephrased as "is the fact that Firefox has been logging all users' entire browsing history despite the fact that the user has not chosen to set up a Firefox account going to be disclosed?"

Chill out, this preference only determines what is logged locally (never sent to the server). It's a debugging tool.

Sources: - https://searchfox.org/mozilla-central/source/toolkit/compone... - https://searchfox.org/mozilla-central/source/services/common...