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I guess, you might have enabled "Facebook Container" add-on while browsing this site. It is very restrictive in terms of blocking content that comes from Facebook Inc. addresses.

[0]: https://addons.mozilla.org/en-US/firefox/addon/facebook-cont...

Are you blocking some Facebook CDN domains perhaps?

Found the problem, Facebook Container extension blocked the js file.

Works for me using Firefox for Android, version 67.0.2