Wow! Thanks so much, everyone. So here's the action I've taken:
1. Submitted the url to Avast for analysis, as per Asyn's suggestion
2. Checked out aw-snap, as Polonus recommended, and have now fixed the broken links to the Terms & Privacy docs. There are still a couple of urls listed after running the report again, that really shouldn't be, as the intended pages in those directories open without any problems.
3. Tried to make sense of the link Polonus provided for observatory.mozilla.org, but gave up in the end because it was all gobbledegook to me.
4. Checked out ip-finder.me, suggested by Polonus again, and cannot understand why my site is blacklisted, or what to do about it.
So, I'll wait for Avast to get back to me and take it from there, I guess.
Thank you all so very much for your replies. It's really helped, and could even resolve the issues I'm having. You guys are awesome!