--- a/browser/components/customizableui/CustomizeMode.jsm
+++ b/browser/components/customizableui/CustomizeMode.jsm
@@ -901,16 +901,22 @@ CustomizeMode.prototype = {
       } else if (wrapper.hasAttribute("haswideitem")) {
         wrapper.removeAttribute("haswideitem");
       }
     }
 
     let removable = aPlace == "palette" || CustomizableUI.isWidgetRemovable(aNode);
     wrapper.setAttribute("removable", removable);
 
+    if (AppConstants.platform == "win") {
+      // Allow touch events to initiate dragging in customize mode.
+      // This is only supported on Windows for now.
+      wrapper.setAttribute("touchdownstartsdrag", "true");
+    }
+
     let contextMenuAttrName = "";
     if (aNode.getAttribute("context")) {
       contextMenuAttrName = "context";
     } else if (aNode.getAttribute("contextmenu")) {
       contextMenuAttrName = "contextmenu";
     }
     let currentContextMenu = aNode.getAttribute(contextMenuAttrName);
     let contextMenuForPlace = aPlace == "panel" ?