This file is indexed.

/usr/share/xul-ext/uppity/skin/uppity-overlay.css is in xul-ext-uppity 1.5.8-3.

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

The actual contents of the file can be viewed below.

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#tb-uppity {
  list-style-image: url("chrome://uppity/skin/tb-icon-large.png");
}
toolbar[iconsize="small"] #tb-uppity {
  list-style-image: url("chrome://uppity/skin/tb-icon-small.png");
}