Pocket has helped millions save articles and discover stories worth reading. But the way people save and consume content on the web has evolved, so we’re channeling our resources into projects that better match browsing habits today. Discovery also continues to evolve; Pocket helped shape the curated content recommendations you already see in Firefox, and that experience will keep getting better. Meanwhile, new features like Tab Groups and enhanced bookmarks now provide built-in ways to manage reading lists easily.

What’s the discovery replacement they are referring to here?