1. Well looking for duplicates and problem names + 1 stars. 2. There is no button to stop checking the bookmarks. If you close the tab, then the process continues and helps to unload the browser through the task manager - minus the star. 3. Does not display what errors occurred when connecting, namely 404, 505, etc. - minus the star. 4. There are no settings for the number of requests to the site when checking - minus one star.