I am trying to delete the icons that websites use which are located in the user file of appdata/local/mozilla, and the website adresses that are located at the bottom of the thumbnails when opening a new tab. clearing data deletes the actual thumbnails, however the adresses are still located below where the thumbnails would be. I have tried clearing history with everything checked, and all history selected to be cleared, and also deleted the cache and cookies. what can I do to delete these things? Thanks