RTSP works also in mozilla (1.6 at least): add line: user_pref("network.protocol-handler.app.rtsp","/usr/local/bin/realplay"); to file: prefs.js found in: ~/.mozilla/default/xxx/prefs.js (if you use other than defualt profile, put it there; xxx is place holder for something). Be sure mozilla is not running while editing prefs.js. Posted by: psa on March 4, 2004 05:24 AM man you nailed it. I put user_pref("network.protocol-handler.app.rtsp", "/usr/local/HelixPlayer/hxplay"); in prefs.js now firefox recognizes rtsp and starts HelixPlayer. Cool. I couldn't even find that one on Mozillazine.