I've been getting this for while (but only on some sites like Argos etc).
I'm using Firefox, which I've uninstall and reloaded and reinstalled the Java add on, but the error came right back !
Every page comes up with 'We're sorry, there was an error. Description:Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIStringBundle.formatStringFromName] occurred when we did C24Extension.Overlay.OnDOMContentLoaded'
Any thoughts ??