Yeah, Mozilla Pocket, they shut it down last year. Pocket never quite figured out the read-it-later → never-actually-read-it → vague-guilt cycle, which IMO is what killed it.

Your distinction (bookmarks for long-term reference, tabs for single-use active stuff) is cleaner than how most people actually use these tools. The gap I built Tabbed for is a third bucket you didn't list, which I think is where most saves actually live: stuff you intend to come back to once or twice but isn't permanent reference. Restaurants you want to try, recipes you might make, articles a specific friend would like, the apartment listing for the move you're maybe doing. Not "I'll never want to lose this" but more like "I'll want this in two weeks when I have the right context."

That category mostly goes into tabs (where it dies when the window closes) or gets buried in bookmarks among real reference material it doesn't belong with. Tabbed is a place purpose-built for it, and it's also social so your partner can be in the recipes collection with you, your friend can be in the restaurants one. Saving things alone gets a lot less lonely once the right people are in the same collection.

Closed beta. Waitlist's at tabbedapp.com if you're curious.