CKEditor – FontAwesome tags removed
add to config.js, upload and refresh (clear cache using ctrl+F5)config.protectedSource.push( /<i class[\s\S]*?\>/g ); config.protectedSource.push( /<\/i>/g );source: https://ckeditor.com/old/forums/CKEditor/FontAwesome-tags-removed-when-switching-between-Source-and-Wysiwyg