--- a/browser/actors/ContextMenuChild.jsm
+++ b/browser/actors/ContextMenuChild.jsm
@@ -686,17 +686,33 @@ class ContextMenuChild extends ActorChil
     this.context = Object.create(null);
     const context = this.context;
 
     context.timeStamp = aEvent.timeStamp;
     context.screenX = aEvent.screenX;
     context.screenY = aEvent.screenY;
     context.mozInputSource = aEvent.mozInputSource;
 
-    const node = aEvent.composedTarget;
+    let node = aEvent.composedTarget;
+
+    // Set the node to containing <video>/<audio> if the node
+    // is in the videocontrols UA Widget.
+    if (this.content.ShadowRoot) {
+      let n = node;
+      while (n) {
+        if (n instanceof this.content.ShadowRoot) {
+          if (n.host instanceof this.content.HTMLMediaElement) {
+            node = n.host;
+            break;
+          }
+          break;
+        }
+        n = n.parentNode;
+      }
+    }
 
     const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
 
     context.shouldDisplay = true;
 
     if (node.nodeType == node.DOCUMENT_NODE ||
         // Don't display for XUL element unless <label class="text-link">
         (node.namespaceURI == XUL_NS && !this._isXULTextLinkLabel(node))) {