This superb tool got my bookmark collection out of a huge mess – a snarl that, as it turned out, contained some 15,000 duplicates, most of which were created by forces unknown to me (presumably bookmarks synchronizers) and a few by my own fumbling. To untangle this snarl, I had to use the tool's "expert mode" and get some help from Martin Väth, its creator, whose assistance was very clear and correct (as is his published documentation of the tool).