This file is indexed.

/usr/share/xul-ext/refcontrol/chrome/skin/toolbar_button.css is in xul-ext-refcontrol 0.8.16-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#refcontrol-toolbarbutton {
  list-style-image: url("chrome://refcontrol/skin/icon_enabled.png");
}

#refcontrol-toolbarbutton[enabled="false"] {	
  list-style-image: url("chrome://refcontrol/skin/icon_disabled.png");
}