[Default Applications]
# grep ^MimeType /usr/share/applications/chromium.desktop | sed 's/MimeType=//g' | tr ';' '\n' | sort -u | while read -r line; do echo $line=chromium.desktop; done
application/xhtml+xml=chromium.desktop
text/html=chromium.desktop
text/mml=chromium.desktop
text/xml=chromium.desktop
x-scheme-handler/http=chromium.desktop
x-scheme-handler/https=chromium.desktop
x-scheme-handler/http=chromium.desktop;
x-scheme-handler/https=chromium.desktop;
x-scheme-handler/mailto=thunderbird.desktop;