/usr/share/applications/screensavers/flurry.desktop is in xscreensaver-gl-extra 5.30-1+deb8u2.
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 | [Desktop Entry]
Name=Flurry
Exec=/usr/lib/xscreensaver/flurry -root
TryExec=/usr/lib/xscreensaver/flurry
Comment=This X11 port of the OSX screensaver of the same name draws a colourful star(fish)like flurry of particles. Original Mac version: http://homepage.mac.com/calumr Written by Calum Robinson and Tobias Sargeant.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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