[Default Applications]

application/pdf=atril.desktop
application/x-pdf=atril.desktop
application/x-bzpdf=atril.desktop
application/x-gzpdf=atril.desktop

text/csv=org.gnome.gedit.desktop
text/markdown=org.gnome.gedit.desktop
text/plain=org.gnome.gedit.desktop

image/bmp=org.xfce.ristretto.desktop;gimp.desktop
image/gif=org.xfce.ristretto.desktop;gimp.desktop
image/jpeg=org.xfce.ristretto.desktop;gimp.desktop
image/png=org.xfce.ristretto.desktop;gimp.desktop
image/svg+xml=org.xfce.ristretto.desktop;gimp.desktop
image/webp=org.xfce.ristretto.desktop;gimp.desktop
image/x-canon-cr2=darktable.desktop;ristretto.desktop;gimp.desktop
image/x-xcf=gimp.desktop

video/3gpp=mpv.desktop;vlc.desktop
video/mp4=mpv.desktop;vlc.desktop
video/mpeg=mpv.desktop;vlc.desktop
video/ogg=mpv.desktop;vlc.desktop
video/quicktime=mpv.desktop;vlc.desktop
video/webm=mpv.desktop;vlc.desktop
video/x-flv=mpv.desktop;vlc.desktop
video/x-matroska=mpv.desktop;vlc.desktop
video/x-ms-asf=mpv.desktop;vlc.desktop
video/x-msvideo=mpv.desktop;vlc.desktop

application/x-extension-htm=firefox.desktop
application/x-extension-html=firefox.desktop
application/x-extension-shtml=firefox.desktop
application/x-extension-xht=firefox.desktop
application/x-extension-xhtml=firefox.desktop
application/xhtml+xml=firefox.desktop
application/xml=firefox.desktop
text/html=firefox.desktop
text/xml=firefox.desktop
x-scheme-handler/http=firefox.desktop
x-scheme-handler/https=firefox.desktop
x-scheme-handler/chrome=firefox.desktop