Replace the system default program
The default configuration of the system in the program:~/.config/mimeapps.list
For example, I put before the default browser Google browser Batch replaced with other programs, too
[Default Applications]
x-scheme-handler/http=google-chrome-stable.desktop
x-scheme-handler/https=google-chrome-stable.desktop
x-scheme-handler/ftp=google-chrome-stable.desktop
x-scheme-handler/chrome=google-chrome-stable.desktop
text/html=google-chrome-stable.desktop
application/x-extension-htm=google-chrome-stable.desktop
application/x-extension-html=google-chrome-stable.desktop
application/x-extension-shtml=google-chrome-stable.desktop
application/xhtml+xml=google-chrome-stable.desktop
application/x-extension-xhtml=google-chrome-stable.desktop
application/x-extension-xht=google-chrome-stable.desktop
image/jpeg=viewnior.desktop;gpicview.desktop;
image/png=viewnior.desktop;gpicview.desktop;
text/plain=mousepad.desktop
x-scheme-handler/mailto=userapp-Thunderbird.desktop
message/rfc822=userapp-Thunderbird.desktop
application/pdf=epdfview.desktop
application/x-bittorrent=deluge.desktop
[Added Associations]
x-scheme-handler/http=google-chrome-stable.desktop;
x-scheme-handler/https=google-chrome-stable.desktop;
x-scheme-handler/ftp=google-chrome-stable.desktop;
x-scheme-handler/chrome=google-chrome-stable.desktop;
text/html=google-chrome-stable.desktop;
application/x-extension-htm=google-chrome-stable.desktop;
application/x-extension-html=google-chrome-stable.desktop;
application/x-extension-shtml=google-chrome-stable.desktop;
application/xhtml+xml=google-chrome-stable.desktop;
application/x-extension-xhtml=google-chrome-stable.desktop;
application/x-extension-xht=google-chrome-stable.desktop;
image/jpeg=viewnior.desktop;gpicview.desktop;
image/png=viewnior.desktop;gpicview.desktop;
text/plain=mousepad.desktop;
message/rfc822=userapp-Thunderbird.desktop;
application/pdf=epdfview.desktop;
application/x-bittorrent=deluge.desktop;