In a lot of booru imageboards there's the "fav:username" tag option to search through your own favorites if you want (or something similar). Can we please implement this if it isn't a thing here already? :(

I'm afraid said function is not available at the moment here, I could suggest this to slayerduck though :)

I was talking with Slayerduck about this and it was said it's not possible to do it, so you'll gotta do it the old-fashioned way, navigating through your favs until you find the picture you're looking for.