@timbray Alternately: there's no reason you can't dereference the HTTP URL and understand that it's a Fediverse object, as long as the RDF-style metadata is there. If we're already discussing adding features to the browser, that approach would degrade better.
@peeja I guess by dispatching off the content-type, you mean? Hmm, are there any registered AcitivityPub content-types?