Do you use Font Awesome Pro and Atomic Blocks on your site at the same time? If so, this code is for you...
The Atomic Blocks plugin is distributed with Font Awesome Free. On our sites, we use Font Awesome Pro. The consequence for using both the plugin and the do-it-yourself method is that when your site is rendered in the browser, two copies of the Font Awesome all.min.css file is loaded simultaneously. There's no good reason to have two versions of one file loaded at the same time. The Pro version of the file is sufficient to cover everything.
If this is a problem you've experienced, use this code snippet to deactivate the Atomic Blocks Font Awesome Free in favor of your own Font Awesome Pro installation. This does not impact the use of Atomic Blocks version in the editor. It only works on the front end.
Add this code to your functions.php right before you enqueue the Pro version of all.min.css.