--- a/toolkit/devtools/touch-events.js
+++ b/toolkit/devtools/touch-events.js
@@ -189,22 +189,26 @@ function TouchEventHandler (window) {
           this.touchstartTime = Date.now();
         } else if (name == "touchend") {
           // If we have a 'fast' tap, don't send a click as both will be turned
           // into a click and that breaks eg. checkboxes.
           if (Date.now() - this.touchstartTime < delay) {
             this.cancelClick = true;
           }
         }
+        function clone(obj) {
+          return Cu.cloneInto(obj, target);
+        }
         let unwraped = XPCNativeWrapper.unwrap(target);
-        unwraped.sendTouchEvent(name, [0],                    // event type, id
-                                [evt.clientX], [evt.clientY], // x, y
-                                [1], [1],                     // rx, ry
-                                [0], [0],                     // rotation, force
-                                1);                           // count
+        unwraped.sendTouchEvent(name, clone([0]),       // event type, id
+                                clone([evt.clientX]),   // x
+                                clone([evt.clientY]),   // y
+                                clone([1]), clone([1]), // rx, ry
+                                clone([0]), clone([0]), // rotation, force
+                                1);                     // count
         return;
       }
       let document = target.ownerDocument;
       let content = this.getContent(target);
 
       let touchEvent = document.createEvent('touchevent');
       let point = document.createTouch(content, target, 0,
                                        evt.pageX, evt.pageY,