Stonehenge. Built between 3100-1100 BC. It is estimated that 30 MILLION hours of labour went into its construction, but it's precise purpose and who built it remains a mystery.
If you think this add-on violates Mozilla's add-on policies or has security or privacy issues, please report these issues to Mozilla using this form.
Please don't use this form to report bugs or request add-on features; this report will be sent to Mozilla and not to the add-on developer.