I'm not much into why something was done, just into why something happens and how to put it back if I don't like. I did decide after awhile that I don;t like it and put it back. Would also say that I would never see it on my bookmarks toolbar because I get rid of all favicons there, but want them in folder there and everywhere else including on tabs and location bar. I put mine back with a style, and if there are changes to fix it in the Library List the style is likely to get updates and be a shown as an update available rather than picking it off of blog which seldom get updates, or a question where it may continue to get updates but you are not likely to see them. Bookmark favicon changed OR missing in Fx8 from dog-eared white sheet to dotted outline * https://support.mozilla.com/questions/897411#answer-276343 *** *: picture at https://support.mozilla.com/kb/latest-firefox-issues#w_my-bookmark-or-page-icons-are-gone *: gallery picture in above https://support.mozilla.com/media/uploads/gallery/images/2011-11-10-15-42-42-6f20e8.png Some other links: : https://support.mozilla.com/questions/894100 : favicon changed to dotted outline, use "CheckPlaces" to restore icons after Sync : https://support.mozilla.com/questions/890741 restore use of old icon (Cor-el) : favicon picker may lose icons see support page, sync may lose icons see