This file is indexed.

/usr/share/xul-ext/greasemonkey/skin/browser.css is in xul-ext-greasemonkey 3.8-1~deb8u1.

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

The actual contents of the file can be viewed below.

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#greasemonkey-tbb {
  list-style-image: url("chrome://greasemonkey/skin/icon24.png");
}
toolbar[iconsize="small"] #greasemonkey-tbb {
  list-style-image: url("chrome://greasemonkey/skin/icon16.png");
}

#greasemonkey-tbb[disabled="yes"] {
  opacity: 0.8;
}
#greasemonkey-tbb[disabled="yes"] .toolbarbutton-text {
  text-decoration: line-through;
}
#greasemonkey-tbb[disabled="yes"] .toolbarbutton-icon {
  opacity: 0.5;
}

/* The "blank" ID prevents loops; it's not on the replacement. */
#greasemonkey-tbb menupopup#blank {
  -moz-binding: url('chrome://greasemonkey/content/bindings.xml#greasemonkey-tbb')/**/
}

.popup-notification-icon[popupid="greasemonkey-grants"],
.popup-notification-icon[popupid="greasemonkey-notification"]
{
  list-style-image: url("chrome://greasemonkey/skin/icon32.png");
}