hello Mr E
just to suggest a possible quick fix,
download Google Chrome browser -- Google Chrome - Get a fast new browser. For PC, Mac, and Linux
once downloaded and installed, use Chrome to browse to CBS.com
in case you have installed any advertisement or pop-up blocking programs aside from those internallt built-in to Firefox and IE, using a new browser like Chrome would bypass this adblocking effect.
on my Firefox browser, CBS.com works fine, though im not able to view videos because of the notice that the videos are not allowed for the ip address of my country. goodluck on this