In order to click "mailto:" links on Web pages to launch an email program, Firefox (or Iceweasel on Debian) needs to be told which email program to use.

To do this, type "about:config" in Firefox's address bar, type in "mailto" in filter, look if "network.protocol-handler.external.mailto" preference has value "true". By default, it's true. If not, set it to be true. Then check if "" exists or not. By default it's not. We need to create one: right click, select "New"->"String", then type in "network-protocol-handler-app.mailto", then type in the path name of your email program. In my case, it's "/usr/bin/kmail". That's it, Firefox should now be able to launch the email program when a "mailto:" link is clicked.


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