Please see how launchpad-integration does it, falling back to x-www-browser /usr/share/launchpad-integration/launchpadintegration/urls.py
-- Apport Open a not primary browser in XFCE https://launchpad.net/bugs/64209 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
