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//If you want to execute your code when the API is fully loaded, use CKEDITOR.loaded event:
CKEDITOR.on( 'loaded', function( evt ) {
    // your stuff here
} );

//If you want to execute your code when any new instance is ready, use CKEDITOR.instanceReady event:
CKEDITOR.on( 'instanceReady', function( evt ) {
    // your stuff here
} );

//If you want to execute your code when a particular instance is ready, then use CKEDITOR.editor.instanceReady event:
CKEDITOR.replace( 'editor', {
    on: {
        instanceReady: function( evt ) {
            // your stuff here
        }
    }
} );