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That sounds awful. Can you export your bookmarks as csv or json? If so, you can use duckdb (or xsv) to clean any duplicates.

While you're at it, I'd recommend to consider uploading the new bookmarks to a dedicated bookmark manager and avoid having the browser manage your bookmarks. For folks who rely on bookmarks, dedicated bookmark managers offer great value (eg. auto-archiving a copy of every bookmark to combat link rot). I currently use Raindrop, but if I were to start fresh I'd go with Linkwarden instead.

This is just so Edge. Unrelated with this post - I used to hate Edge so much for poping out and ask to replace Chrome. Therefore I insisted on using Chrome for years. One day I misclicked, and found out that Edge had exactly cloned my Chrome, and I was like: fine, I'll give it a try. Now Edge wins.

the tool is called chatGPT ) just export your bookmarks to html, send to gpt-4, ask it to de-duplicate and organize, most likely it will work well.