First check the complete hostname. Then check it with a "." at the front. Then strip off the first part ('www' or 'en' or whatever). Continue until you find the correct hostname.
Thank you for the workaround. This is what I did when looking, it would be better not to have to workaround the problem of not being told the complete hostname on wikipedia site though.
Mozilla's cookie manager UI is pretty crappy, unfortunately, but you need to learn to deal with it if you're going to use it. That's not our problem, sorry.
Wikipedia could make it more simple. Presently wikipedia is making it as difficult as it can by not listing the complete hostname which has a cookie block error when displaying such an error.
Kind regards
JG