I wanted to customize the images displayed on the thumbnails on the New Tab Page. I tried using the addon "New Tab Tools" to do so and it worked, for a while. Now a bug seems to have affected it (it is not displaying any thumbnails, so I uninstalled it). So I want to try another approach. I want to MANUALLY change the images for each of the thumbnail on the new tab page (of course, the thumbnails are 'pinned'). (I read some other articles related to thumbnails, specifically about DELETING them, and it asked me to open the Firefox Profile Folder, and in there, delete the thumbnails folder. I thought I could simply change the images stored in it instead of deleting them, but there is NO thumbnails folder in the Firefox profile folder (I accessed the profile folder thru the troubleshooting information section in the help menu). So where is this thumbnails folder after all?) So, how can I do it? Thanks in advance.