After you import bookmarks from another computer, I have two copies of each other: How can I delete the copy of 'just '?

I managed to import my favorites from my old to new Macbook. But now, there are two copies of everything, filed one after the other. I tried to delete a game, but only removed those organized in folders. There are still double rooms, a large number of bookmarks. So, when I bookmark new pages on the new computer, he adds at the end of a list of favorites, but not the other and it's list who don't not the files from the old computer. How can I remove a set of bookmarks, but keep the game that it adds to and keep my records?

I think that in this case you need an addon:

Tags: Firefox

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