mitmdetection.services.mozilla.com is a subdomain operated by Mozilla, the company behind Firefox. While the site currently shows a 404 error and doesn't load properly, that's a technical hiccup rather than a sign of fraud. Mozilla is a globally recognized organization with a long track record, so you can trust that this domain is legitimate.
For an internal or infrastructure-related service like this, the absence of a contact page, privacy policy, or social media links is perfectly normal. These aren't consumer-facing pages — they're backend services. The main concern here is that the site isn't working, but that's a reliability issue, not a safety one.
If you encountered this domain while using a Mozilla product, it's safe. Just know that the service it points to appears to be offline or misconfigured right now. There's no indication that mitmdetection.services.mozilla.com is a scam or fake — it's simply not serving content at the moment.