Since updating to 3.6.12, Firefox displays a warning message when downloading files know to be PDF from a server site. The files download to the desktop with .php extension but instead of opening in Preview, as they had done before the update, I see the following warning: “show_document.php” is a script application which was downloaded from the Internet. Are you sure you want to open it?" I of course would like to open and view it. The file extension can be manually changed to .pdf and then opened in Preview. This also occurs with .txt or .doc files the have .php originally. Please advise on how to correct this bug in the update.