[dspillett]

Exactly. There are a few obvious things that want to be allowed and many others (sites playing adverts and such) that don't.

White-listing youtube would be one click for ever (potentially) and the same for other similar sites (vimeo, maybe facebook, ...) - in fact not even that as common sites like that could be on the list by default (as long as there is an easy way to de-list them).