My Debian desktop has the following alternatives setup: 
www-browser (/usr/bin/w3m)

mozilla (
 +    1        /usr/bin/mozilla-suite
*     2        /usr/bin/mozilla-firefox
)

x-www-browser (
      1        /usr/bin/mozilla
      2        /usr/bin/epiphany
 +    3        /usr/bin/konqueror
*     4        /usr/bin/mozilla-firefox
)

[download]
So either mozilla or x-www-browser seem like sensible "launch-url" commands.

In reply to Re^3: Launch CPAN search in browser from Windows command shell by rhesa
in thread Launch CPAN search in browser from Windows command shell by xdg

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