Please consider adding a section listing if the webpage and the images were retrieved with IPv4 or IPv6. This would ease in troubleshooting issues with one protocol or the other.
Gecko will fallback to IPv4 dynamically and a html page can be loaded via IPv6 while one or more elements of the page like images are loaded via IPv4. A page can be also loaded via disk cache and would not hit the net at all. For a general ipv6 status overview of a domain use an addon like https://addons.mozilla.org/en-US/firefox/addon/4or6/
Priority: P2 → --
Target Milestone: Firefox 12 → ---
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