Ticket #20012: 20012.user_can_richedit.diff

wp-includes/general-template.php

@@ -1759 +1759 @@
                                 $wp_rich_edit = true;
                         }
                 }
+
+                // Kindle Fire / Amazon Silk - doesn't support `contentEditable`
+                if( false !== strpos( $_SERVER['HTTP_USER_AGENT'], '; Silk/' ) )
+                        $wp_rich_edit = false;
+
         }
 
         return apply_filters('user_can_richedit', $wp_rich_edit);