CheckPlaces is a light, free add-on for the famous Internet browser Mozilla Firefox that manages your Favourites folder. For example, it tells the user about pages in the Favourites folder that have stopped being active, something useful for those who have dozens of pages to choose from.
CheckPlaces, on the other hand, tells you if you have webpages in more than one place.
The program is free and very quick, it hardly takes three minutes to scan hundreds of webpages. Its interface is simple, just one screen, but very practical and intuitive.