Hello,
I think CCleaner is doing something inappropriate to Firefox. After I clean its cache, history, cookies and compact its database, I encounter problem accessing websites : I need to clic many times on them (on the address bar or from my bookmarks) to make them load and it's driving me mad.
I've tried everything on FF (add-ons, safe mode, serviceworkers, etc...) and just found out that if I don't use CCleaner and just use FF options to clean the cache, history & cookies my websites are ok to be visited once I rerun FF.
So, I wanted to report it. Maybe it may lead the light on something I'm truly missing here.
Best regards,