Those are the MD5 hashes of a lot of adult sites. They list them, so they can filter them from “often visited”. In https://bugzilla.mozilla.org/show_bug.cgi?id=1159884 they reason, that this is so that virus scanners don’t detect FF as malicious (due to containing references to those sites). Let’s get the list!
You can also access this list locally by typing in resource://activity-stream/lib/FilterAdult.sys.jsm
into your URL bar.
[Note that this post is technically not NSFW as they are only MD5 hashes.]
Someone share all these in unhashed form, for educational purposes
so they can filter them from “often visited”
But according to the issue on Bugzilla you have attached, this is to prevent suggested sites from showing alongside these adult sites, without filtering the latter out. Do I understand it wrong?
the .jsm extension was made for this
Should be pretty easy to bruteforce with the right mask applied.