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How to set system-wide default application for protocol handler?

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Hi, I've got a multi-user system. When a user clicks a link "hello:world" or similar in firefox, an external application shall open the link. I created /usr/share/applications/hello.desktop: http://codepad.org/hFkoPMuF

Now, when a user clicks a link, he gets a window shown "This link needs to be opened with an application. Send to: [Choose an Application]".

However, the user should not need to choose anything. I want him to just click the hello: link and the application shall run without any further action. How can I setup such a system default?

Running either Debian with gnome3 or Ubuntu with unity.

Modified by Wulf4096

Additional System Details

Installed Plug-ins

  • Google Talk Plugin Video Accelerator version:
  • Version:
  • Shockwave Flash 11.2 r202


  • User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20100101 Firefox/17.0 Iceweasel/17.0.1

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