I understand this might overlap a bit with Tags. In theory, Collections are for simple hierarchies, and Tags are for cross-references. But anyone who saves lots of bookmarks eventually hits the same problem: sometimes a Collection belongs in two different places… Example: a Collection about "Electronic Music Instruments" could live under "Music", but it also fits naturally under "Electronics". Choosing one feels arbitrary, and moving it back and forth doesn’t solve the issue. I believe that giving a Collection true multiple parents would be both difficult to implement, and confusing in the UI. But a simpler solution, like Collection Shortcuts could work. A shortcut would: Look like the original Collection (but with a small marker indicating it’s a shortcut). Appear wherever the user places it in the sidebar. When clicked, open the "real" Collection. This would let users build clearer hierarchies without duplicating bookmarks, and without needing advanced UI changes. It could also cover other existing feature requests, like “Copy Collections” or “Allow Bookmark Duplicates,” but in a cleaner way: nothing is actually copied, so therefore there is no duplication - always one single source of truth instead… (The only concern I see is keeping track of all shortcuts, so if a collection is deleted, its shortcuts should be deleted, too.) Bonus points: maybe allow shortcuts for individual bookmarks, too? 🙂
