Hello there, newcomer here. I'm not sure if this is a bug or not but I recently updated to the latest version of Firefox (version 55) and notice that my favicons or site icons keeps getting deleted when I use CCleaner, which never happened before, at least not with older versions of Firefox. I've pinned the culprit down to the 'Internet History' checkbox in CCleaner, but what I'd like to know is if this is normal, why do I have to clean my favicons just to delete internet history for Firefox now