When you open a new tab in Mozilla Firefox, then by default it shows you thumbnails of websites based on how frequently you have visited them and how recently as well. For most users this feature is really useful since it provides quick access to frequently visited sites and allows pinning and rearranging favorite web pages on the new tab page. But there is a category of users who care about privacy or have to share their browser with other people. In such a case, they may want to disable the new tab page thumbnails. Here is how you can do that.