[Default Applications]
image/jpg=emacsclient.desktop;
image/png=emacsclient.desktop;

video/mp4=emacsclient.desktop;
video/webm=emacsclient.desktop;
video/x-msvideo=emacsclient.desktop

audio/mpeg=emacsclient.desktop;
audio/x-vorbis+ogg=emacsclient.desktop;

text/plain=emacsclient.desktop;
text/html=firefox-esr.desktop;

application/pdf=emacsclient.desktop;
application/epub+zip=emacsclient.desktop;

x-scheme-handler/mailto=emacsclient-mail.desktop;

x-scheme-handler/http=firefox-esr.desktop;
x-scheme-handler/https=firefox-esr.desktop;
x-scheme-handler/about=firefox-esr.desktop;