Bug#1013958: more info

[Chris Waters <xtifr.w@gmail.com>]

I have learned more about this. It turns out that it only happens if
the user has not set the xfce default browser app! Without a user-set
default, exo-open defaults to using x-www-browser, but
xfce4-terminal's context menu prefers chromium!

Once a user setting _exists_, the context menu happily uses it, but
until then, it will choose chromium over x-www-browser.

This is a minor bug, since there's an easy workaround: the user can
actually set their default apps. But I think it's still a bug. (Also,
it seems odd that the context menu doesn't just call exo-open, but
there may be reasons for that.)