You publish AAAA DNS records for accounts.firefox.com, which I can reach from my IPv6-only environment, but the content of that page tries to load content from cdn.accounts.firefox.com which DOES NOT have AAAA DNS records and therefore I am unable to actually log in to my account. I applaud you for making the effort to support IPv6, but it's only half-working when not all parts of the supply chain are dual-stack enabled. Anything that you can do to rectify this situation would be most appreciated. Thanks for your attention and consideration.