Mozilla: [ addons-preview-cdn.mozilla.net ] A subdomain takeover is available via unregistered domain in Fastly

The domain addons-preview-cdn.mozilla.net was found to CNAME resolve to addons.allizom.org, which was hosted on Fastly's service. The domain addons-preview-cdn.mozilla.net was not registered within Fastly, resulting in a "Fastly error: unknown domain" message. The vulnerability was demonstrated b...