/usr/share/applications/epiphany.desktop is in epiphany-browser 3.18.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | [Desktop Entry]
Name=Web
GenericName=Web Browser
X-GNOME-FullName=Epiphany Web Browser
Comment=Browse the web
Keywords=web;browser;internet;
Exec=epiphany %U
StartupNotify=true
Terminal=false
Type=Application
Icon=web-browser
Categories=Network;GNOME;GTK;WebBrowser;
MimeType=text/html;text/xml;application/xhtml+xml;x-scheme-handler/http;x-scheme-handler/https;multipart/related;application/x-mimearchive;message/rfc822;
Actions=Incognito;
X-Ubuntu-Gettext-Domain=epiphany
[Desktop Action Incognito]
Name=New Incognito Window
Exec=epiphany --incognito-mode
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