I also have a similar need but for upvoted content. Sometimes I keep scrolling through pages of upvotes to find a specific item. The problem is that favourites and upvotes are not exposed via the API and require scraping, otherwise it would be easier to build a search tool for them.
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We'd have to build that into HN itself, since upvote data is private (extremely so). But it's the sort of feature whose value grows as the site continues, so I could imagine us adding it eventually.