1. Open Firefox, type "about:config" (omit the quotes) in the address bar, and then click the "I'll be careful, I promise" button when the warning page appears.
2. Right-click anywhere on the page and select the "New" item in the context menu. Choose "Boolean" from the submenu, type "network.protocol-handler.expose.rtsp" (omit the quotes), and then press "Enter."
3.Select "False" from the drop-down menu, and then press "Enter" to save the new entry. Close the about:config tab in Firefox, and then go to an RTSP address in the browser. A Firefox prompt appears, asking you to select a program with which to open the streaming media. Check the check box in the prompt to always use the selected program, if applicable.