Ticket #8864: 8864_2.patch

_source/plugins/floatpanel/plugin.js

@@ -47 +47 @@
                                 element = panel.element,
                                 iframe = element.getFirst().getFirst();
 
+                        // Disable native browser menu. (#4825)
+                        element.disableContextMenu();
+
                         this.element = element;
 
                         this._ =

_source/plugins/panel/plugin.js

@@ -227 +227 @@
         {
                 var blocks = this._.blocks,
                         block = blocks[ name ],
-                        current = this._.currentBlock,
-                        holder = this.forceIFrame ?
-                                this.document.getById( this.id + '_frame' )
-                                : this._.holder;
+                        current = this._.currentBlock;
 
-                // Disable context menu for block panel.
-                holder.getParent().getParent().disableContextMenu();
+                // ARIA role works better in IE on the body element, while on the iframe
+                // for FF. (#8864)
+                var holder = !this.forceIFrame || CKEDITOR.env.ie ?
+                                 this._.holder : this.document.getById( this.id + '_frame' );
 
                 if ( current )
                 {