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What methods exist to de-duplicate Firefox bookmarks.

As I search Google I find that there previously was a plugin called CheckPlaces, but that no longer seems to exist. Another popular suggestion seems to be AM-DeadLink, which I tried, but it completely trashed my bookmarks. (Fortunately I had a backup first, and yes I had closed Firefox first as instructed).

I was trying to move all my youtube.com bookmarks into a folder. I tried doing a search, and then dragging the bookmarks into the folder. Apparently this creates a copy, instead of moving them as I expected. So now I have 3 of everything since I had tried a couple times.

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up vote 3 down vote accepted

Might be heavier than you want, but if you are using XMarks or are open to using it, it has a De-Duplicator feature

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Xmarks certainly looks good, but I have a pretty large set of bookmarks (30,000). Any idea if Xmarks will be able to handle that without making a mess? I had tried it in back in the past when it was Foxmarks, and it seemed to act all buggy. (asked on webapps.stackexchange.com/questions/31940/xmarks-limitations) – Zoredache Oct 8 '12 at 17:49
    
You could always try using a portable version of Firefox or a new profile. No permanent harm and it might work in which case you could just export the bookmarks from there and import them to your real Firefox profile. – Wk_of_Angmar Oct 8 '12 at 18:53

You could install the plugin https://addons.mozilla.org/en-US/firefox/addon/bookmark-duplicate-detector/ although at the time of posting it's not available for FireFox 15

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There is apparently a development version for Firefox 13+ located over here: bookmarkdd.mozdev.org/installation.html In any case, you could always just use a standalone (portable) version of an older Firefox version, install this extension, import your bookmarks, do your thing with the de-duplication, export your bookmarks and then just reimport the bookmarks in the normal Firefox installation. – Wk_of_Angmar Oct 8 '12 at 18:50
    
Thank you for the suggestion, it's good to know +1 – Dave Oct 9 '12 at 7:23

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