Real-Time Streaming Protocol is a network protocol used for the transfer of real-time media. In similar fashion to HTTP – which is used to transfer HTML – RTSP can be used over a network or the Web. However, with its default settings, Firefox can’t handle RTSP addresses. To give Firefox the ability to open RTSP addresses, add a new entry to the Firefox configuration file. Firefox then prompts you to select a program that will open the media whenever you visit an RSTP address. Writer Bio

How to Make Firefox Open RTSP Addresses  3 Steps  - 46