I have been trying to delete over 3000 duplicate entries. I have spent over an hour an still had over 3000 left. Installed this app, clicked on three filters and gone! I now have a few over 300 entries in various folders. And all in less than 5 minutes including download and setup. One of the great filters allowed me to select the first item in each group. The duplicate data was presented in groups with similar/same associations. By selecting the fist in each group an delete all the other entries in that group some had 40+ entries of the same site. I did make a backup of my favorites before I hit the delete key.