[Bug] When clicking a URL inside Datcord, it opens with an undetected URI prefix

[burdoto]

Might be related to #69

When clicking a URL inside Datcord, it is being forwarded with a URI scheme open: prefixed.
This URI scheme is not recognized, and trying to assign e.g. "normal" Firefox to it only yields in a default engine search for open:myurl.com.

OS: archlinux 6.9.4 + KDE X11
Version: 0.5.2 (AUR)