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→Duplicate Handling
It would be nice if Firefox warned you about adding a bookmark that matches one with the same URL.
I have a large list of bookmarks, eg 200+ with 30+ folders. Sometimes I bookmark the same page more than once (mainly by acident). it should deal with this intelligently, eg, dont just add another entry, but preferably add any new description/tags to the old locasionlocation, so that you dont have the same page bookmarked multiple times.
Added thought: It would be nice to have a "duplicate bookmark