Most likely you are using an add-on for this feature, maybe the Real downloader? In your "More System Details" to the right of your post, I see several different Real plugins. In case this is a problem with the plugin needing either an update or to be switched to "Always Activate" you could go ahead and visit the Add-ons page using either: * Ctrl+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Plugins. To see whether plugins are disabled ("Never Activate") or require activation every time ("Ask to Activate") you can scroll down and check your Real plugins. To check all your plugins for updates, you can use the link above the list. Note that the Mozilla plugin checker site isn't always up-to-date, so starting your Real software outside of Firefox and using its built-in updater might be a good follow-up. Any improvement?