Thanks for the review.

Most websites will add redirects if the address changes. And Bookmarks Organizer already detects redirects so that you can change your bookmarks. So that part is already implemented.

For the name of the bookmark it's not possible to know if the name was set by the user or not. Many people don't use the website's title as the bookmark's name. I don't understand the "otherwise we must add new website and delete old on" part.