What I want from bookmarks it's not manage them as files, since those files are just links, I'd like to have eventually collected snapshots (like Zotero does),

What I want from bookmarks it's not manage them as files, since those files are just links, I'd like to have eventually collected snapshots (like Zotero does), eventually DIFFING through them (because often articles get modified, without changing title/URL etc), instead of a full snapshot maybe just the "Firefox Reader" version saved so I can avoid wasting space in useless bits, check their on-line status slowly and regularly so when a bookmark is broken I got a small alert and I see it "greyed out" and appear in a dedicated "broken bookmarks" page I can try to update (often the same bookmarked page exist but under a different URL and thanks to the cached copy I can look for the new version or a mirror with a search engine). Files for UIs was an ancient concept trying mimicking paper files, it's about time to use textual pages and search&narrow UIs more than files for many, many things.