Are you seeing this pop up on the top left of the Firefox browser (please see the attachment)? Or in your browser Security Settings Under the “Security” tab please check if these options are checked: * Warn me when sites try to install add-ons * Block reported attack sites (if this is checked, it is possible the site that is downloading the game has been reported) * Block reported web forgeries You can check out those options to see if the browser is blocking the download. You can also check if downloads are working for other sites as well to see if it is blocking just that site.