Hello,
here is another onion-related UX improvement proposal. We still don't have a plan for how to concretely fix the onion naming issue, and we recently released next gen onions so names just got bigger. Ideally we should start experimenting with solutions sooner than later (also see https://blog.torproject.org/cooking-onions-names-your-onions).
I think a local-solution akin to bookmarks makes sense to start with, so I opened a trac ticket today about encrypted bookmarks on Tor Browser: https://trac.torproject.org/projects/tor/ticket/24310
Please let me know if you are aware of firefox addon projects that do encrypted bookmarks that we could use or start basing our work on.
Cheers!