/usr/share/app-install/desktop/xul-ext-ubufox.desktop is in app-install-data 15.10.
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 | [Desktop Entry]
Encoding=UTF-8
Name=Ubufox extension for Firefox
Comment=Ubuntu-specific configuration defaults and apt support for Firefox
GenericName=Firefox theme extension
Type=Application
Icon=ubufox
Categories=Application;Network;
MimeType=application/x-debian-xul-extension-firefox;application/x-debian-xul-extension-firefox-2
StartupNotify=true
X-AppInstall-Package=xul-ext-ubufox
X-AppInstall-Popcon=0
X-AppInstall-Section=main
X-Ubuntu-Gettext-Domain=app-install-data
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