This file is indexed.

/usr/share/xul-ext/ubufox/defaults/preferences/ubuntu-mods.js is in xul-ext-ubufox 2.8-0ubuntu1.

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

The actual contents of the file can be viewed below.

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// look-and-feel modifications in firefox-branding.js
pref("startup.homepage_override_url","chrome://ubufox/locale/ubufox.properties");
pref("startup.homepage_welcome_url","chrome://ubufox/locale/ubufox.properties");

// look-and-feel modifications in firefox.js
pref("browser.startup.homepage","chrome://ubufox/locale/ubufox.properties");

pref("browser.link.open_newwindow", 3);
pref("browser.link.open_external", 3);
pref("middlemouse.contentLoadURL", false); // setting to false disables pasting urls on to the page

// kerberos-for-https
pref("network.negotiate-auth.trusted-uris", "https://");

// Yahoo by default
pref("browser.search.defaultenginename", "chrome://ubufox/locale/ubufox-search.properties");
pref("browser.search.order.1", "chrome://ubufox/locale/ubufox-search.properties");
pref("browser.search.order.2", "chrome://ubufox/locale/ubufox-search.properties");