diff --git a/web/app.js b/web/app.js
index 40ec6796a..832dc1be4 100644
--- a/web/app.js
+++ b/web/app.js
@@ -236,11 +236,6 @@ let PDFViewerApplication = {
     if ('verbosity' in hashParams) {
       AppOptions.set('verbosity', hashParams['verbosity'] | 0);
     }
-    if ((typeof PDFJSDev === 'undefined' || !PDFJSDev.test('PRODUCTION')) &&
-        hashParams['disablebcmaps'] === 'true') {
-      AppOptions.set('cMapUrl', '../external/cmaps/');
-      AppOptions.set('cMapPacked', false);
-    }
     if ('textlayer' in hashParams) {
       switch (hashParams['textlayer']) {
         case 'off':
@@ -1654,10 +1649,6 @@ function webViewerInitialized() {
     }
   }, true);
 
-  appConfig.sidebar.toggleButton.addEventListener('click', function() {
-    PDFViewerApplication.pdfSidebar.toggle();
-  });
-
   try {
     webViewerOpenFileViaURL(file);
   } catch (reason) {
diff --git a/web/pdf_sidebar.js b/web/pdf_sidebar.js
index 4e2ef24f6..5b39cf5bf 100644
--- a/web/pdf_sidebar.js
+++ b/web/pdf_sidebar.js
@@ -390,6 +390,10 @@ class PDFSidebar {
       }
     });
 
+    this.toggleButton.addEventListener('click', () => {
+      this.toggle();
+    });
+
     // Buttons for switching views.
     this.thumbnailButton.addEventListener('click', () => {
       this.switchView(SidebarView.THUMBS);