/usr/share/xfce4/helpers/icecat.desktop is in libexo-helpers 0.10.2-3ubuntu1.
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]
Version=1.0
Icon=icecat
Type=X-XFCE-Helper
Name=Icecat
StartupNotify=false
X-XFCE-Binaries=icecat;icecat-gtk2;icecat-gtk;
X-XFCE-Category=WebBrowser
X-XFCE-Commands=%B -remote "openURL(about:blank,new-window)";%B;
X-XFCE-CommandsWithParameter=%B -remote "openURL(%s)";%B %s;
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