Norton Utilities, Privacy scan Yields Firefox, Mozilla, Netscape and Safari Browsers Folders

When I run the Privacy Scan and the Clean in Progress provides the Clean Sections list, there is a green box for Firefox Browser, Mozilla, Netscape and Safari.  The box is green with a check mark.  I have searched my PC and cannot find any folder(s) for these programs.  Where are these folders or why does Norton Utilities report on these?  Yes, I am thankful the boxes are green BUT..... why can't I find these remnants and delete them???