/usr/share/applications/epiphany-newtab.desktop is in epiphany-browser-data 3.4.0.1-2ubuntu1.
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 | [Desktop Entry]
Name=Web
GenericName=Web Browser
X-GNOME-FullName=Epiphany Web Browser
Comment=Browse the web
Exec=epiphany-browser -n %U
StartupNotify=true
Terminal=false
Type=Application
Icon=web-browser
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=epiphany
X-GNOME-Bugzilla-Component=BugBuddyBugs
X-GNOME-Bugzilla-Version=3.4.0.1
Categories=Network;GNOME;GTK;WebBrowser;
X-Ubuntu-Gettext-Domain=epiphany
MimeType=x-scheme-handler/http;x-scheme-handler/https;
NoDisplay=true
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