We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Youtube, Firefox doesn't know how to open this address, because the protocol (rtsp) isnt assoc. with any program

  • 1 baphendule
  • 30 zinale nkinga
  • 12 views
  • Igcine ukuphendulwa ngu cor-el

more options

just installed Ubuntu 11.04. Tried to view a You tube video (for the first time ever) and got the Alert error message, 'Firefox doesn't know how to open this address, because the protocol (rtsp) isn't associated with any program'. I'm very non-techy and just want to watch a video. Thanks for your understanding!

just installed Ubuntu 11.04. Tried to view a You tube video (for the first time ever) and got the Alert error message, 'Firefox doesn't know how to open this address, because the protocol (rtsp) isn't associated with any program'. I'm very non-techy and just want to watch a video. Thanks for your understanding!

All Replies (1)

more options

You can create these prefs to register the RTSP protocol.

This is an example with the GNOME MPlayer.


network.protocol-handler.app.rtsp "/usr/bin/gnome-mplayer"
network.protocol-handler.external.rtsp (true)
network.protocol-handler.expose.rtsp (false)