This file is indexed.

/etc/xul-ext/ubufox.js is in xul-ext-ubufox 2.0.2-0ubuntu1.

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

The actual contents of the file can be viewed below.

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// Place your global Firefox preferences in this file if you are using
// ubufox. Especially those preferences defined in ubufox need to be configured
// here to become effective.

// Example: Homepage
//pref("browser.startup.homepage", "file:/usr/share/doc/xul-ext-ubufox/example-homepage.properties");