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#11
As far as the Cleaner goes, you use this to do a system cleanup and save file space.
You would not do this while you have programs running or your browser running. As a matter of fact, CCleaner will tell you that you need to close your browser before you can proceed.
You should bookmark all open tabs, save any work, and log out of any sites. When you start again after cleaning you will be starting your sessions over again fresh. Do not rely of the "Restore Session" function if you are going to do a cleanup.
The browser cache is where the vast majority of questionable files (potential threats) reside whenever doing a security scan. It is not a good idea to use the cache as a file folder. A better idea is to clear the cache often, or at least every time you shut down IMHO.