Megalith

My concern isn't what browser the cookies belong to; that is obvious. The question I had was why only CCleaner can detect and delete these "special" cookies. The browsers are oblivious to the fact that they even exist.

There are certain cookies that remain after using a browser's internal clean-up function and/or specialized extensions/add-ons. Why is it that only CCleaner is able to uncover these and delete them?

Is CCleaner able to find and delete DLLs that are no longer used? I believe that the registry cleaner function finds invalid and/or broken entries, but it doesn't actually unregister/delete the DLLs themselves, does it?