Looking a bit further into it, this domain does not seem hacked. It seems to have been deliberately registered for this purpose:
I was just going to say that, it's a 404 on the main page, fresh domain, hacked my ass.
I can't think of any way to prevent this from happening to your typical user. If someone thinks that it's possible for an addon, to monitor other downloaded addons, before they're installed, to check for patterns, then it might be possible to make a quick solution to prevent this in the future.
You should all remember that the perpetrator is constantly promoting his scam here using newbie accounts, and probably reads all of this, so hello scammer, we're trying to stop you
