/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.
1 2 3 4 5 6 | // 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");
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