I've had a problem with You Tube videos downloading/playing slowly and in a choppy manner. Pursuant to their advice, I cleared the cache, which helped somewhat; but they also recommend clearing the cookies, which I thought CCleaner was doing based on my settings. However, the list of cookies displayed remaining and in Firefox (Tools>Options>Privacy>Show Cookies) contains dozens that are not on either the Save or Delete lists in CCleaner, [like this, for instance: adserver2.synapseip.tv,] Why aren't all of these presented for a save or delete option in CCleaner?