After using CCleaner Firefox latest added bookmarks, history and favicons are gone. Checkbox "Internet history" in Applications — Firefox is turning off!
For example,
add bookmark/history —> close FF —> clean with CC —> no new entries;
add bookmark/history —> close FF —> open FF —> close FF —> clean with CC —> everything fine.
Firefox 55.0.3 (x86), CCleaner 5.35.6210.