[yodon]

Security is always complex, and simple rules always have flaws. That doesn’t mean simple rules are always bad, it just means people who build systems around them do need to understand they need to do more than just blindly follow simple rules. I’m pretty sure you’ll find FF doesn’t alert on those sites, because they are being handled by a more complex rule than a vanilla low or medium traffic site.

[ozim]

Funny thing is article is saying "Unfortunately, this message isn’t always accurate. Apparently, sometimes this message is an outright lie.".

So it is not like this domain hosts one bad file and it got flagged, it is apparently more often if it "sometimes .. is .. lie".