readerScrollBar -> readerScrollbar

js/config.js

@@ -280,7 +280,7 @@ export default {
 	// - 'auto':    Show the scrollbar while scrolling, hide while idle
 	// - true:      Always show the scrollbar
 	// - false:     Never show the scrollbar
-	readerScrollBar: 'auto',
+	readerScrollbar: 'auto',
 
 	// Responsively activate the reader mode when we reach the specified
 	// width (in pixels)

js/controllers/reader.js

@@ -361,9 +361,9 @@ export default class Reader {
 			return page;
 		} );
 
-		this.viewportElement.setAttribute( 'data-reader-scroll-bar', config.readerScrollBar )
+		this.viewportElement.setAttribute( 'data-reader-scroll-bar', config.readerScrollbar )
 
-		if( config.readerScrollBar ) {
+		if( config.readerScrollbar ) {
 			// Create the progress bar if it doesn't already exist
 			if( !this.progressBar ) this.createProgressBar();
 
@@ -472,7 +472,7 @@ export default class Reader {
 
 		clearTimeout( this.hideProgressBarTimeout );
 
-		if( this.Reveal.getConfig().readerScrollBar === 'auto' && !this.draggingProgressBar ) {
+		if( this.Reveal.getConfig().readerScrollbar === 'auto' && !this.draggingProgressBar ) {
 
 			this.hideProgressBarTimeout = setTimeout( () => {
 				this.progressBar.classList.remove( 'visible' );