infavorites:mine was fixed for searching within a particular Stack Exchange site, but often I find myself wanting to search for a question I favorited, but not remembering which site it was on when it could conceivably have been on a number of different sites.
On the cross-site search at https://stackexchange.com/search it does not work, presumably because we have different user ids on each site. Is there a way it could be made to work?
Note that this request is for searching, not just viewing, so it's not a duplicate of View "cross-site" favorites?. Just viewing is not very helpful when you have a huge volume of favorites across Stack Exchange sites.