Font Awesome recommends you to use Font Awesome by downloading and embed it to your website instead of using CDN. Firefox and many browsers do not work CDN Font Awesome perfectly. Therefore, if you need to use Font Awesome on your website you need to use it perfectly. In this video, I explained how you could use Font Awesome on your website perfectly. It is very easy. If you have, any question please let me know.
You have another example. I hope it will helpful for you.
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