I use CCleaner 5.35.62.10 and Firefox 56.0.1. I noticed that everytime I clean my system with CCleaner some icons disappears in Firefox bookmarks or looks incorrectly (when some site has an icon from different site). I see this issue with 3 sites: 1) https://www.comss.ru/ 2) https://forum.adguard.com/index.php 3) http://rutracker.org/forum/index.php All these sites pinned in my bookmarks and they lose their icons after cleaning. Also these sites has wrong icon as I said, comss.ru has microsoft icon sometimes and rutracker.org has a gmail's "G" . Same thing happens with https://eromainstream.net/ - it also looses icon after cleanup...