Firefox does not save the favicon for sites that have favicons larger than 16kb. See Mozilla bug 252401. This is because the icon is encoded into the bookmarks.html file adding sites with large icons caused performance issues and crashes.
http://www.ubuntu.com/themes/ubuntu07/favicon.ico size of file 24.62 kb is well past the cut of of 16kb
https://bugzilla.mozilla.org/show_bug.cgi?id=252401
Firefox does not save the favicon for sites that have favicons larger than 16kb. See Mozilla bug 252401. This is because the icon is encoded into the bookmarks.html file adding sites with large icons caused performance issues and crashes.
http:// www.ubuntu. com/themes/ ubuntu07/ favicon. ico
size of file 24.62 kb is well past the cut of of 16kb
https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=252401