According to the comment: * This is the list of preferences that are sent to the content process on * startup. Only prefs that are required immediately upon startup should be * listed here. The first IPC message received in the content process will * contain all the other prefs. Prefs should only be listed here if they must be * read before the first IPC message is received. Yet, most of the prefs found in there do not appear to fall under this category. The media prefs certainly not. Very few prefs needs to be known before the first IPC message. We should remove those that have no place in there.