--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -1421,16 +1421,22 @@
               }
             }
 
             updateUserContextUIIndicator();
             gIdentityHandler.updateSharingIndicator();
 
             this.tabContainer._setPositionalAttributes();
 
+            // Enable touch events to start a native dragging
+            // session to allow the user to easily drag the selected tab.
+            // This is currently only supported on Windows.
+            oldTab.removeAttribute("touchdownstartsdrag");
+            this.mCurrentTab.setAttribute("touchdownstartsdrag", "true");
+
             if (!gMultiProcessBrowser) {
               document.commandDispatcher.unlock();
 
               let event = new CustomEvent("TabSwitchDone", {
                 bubbles: true,
                 cancelable: true
               });
               this.dispatchEvent(event);

--- a/browser/components/customizableui/CustomizeMode.jsm
+++ b/browser/components/customizableui/CustomizeMode.jsm
@@ -899,21 +899,19 @@ 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");
-    }
+    // 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);