I got fed up with having to close Firefox when running Ccleaner, so went back to IE11. Now I find that I have close Edge in Windows 10 to fully run the cleaner. Please fix this!
They can't fix something like that. Firefox, Chrome (and now Edge I assume) use database files to store their cookies, history and more. These files are locked from other programs (ccleaner) while the browser is open. Thus, in order for ccleaner to do its work, the browser must let go of and unlock the files by exiting.