1 files changed, 36 insertions, 0 deletions
diff --git a/toolkit/actors/BrowserElementParent.sys.mjs b/toolkit/actors/BrowserElementParent.sys.mjs
new file mode 100644
index 0000000000..c3cb0991a3
--- /dev/null
+++ b/toolkit/actors/BrowserElementParent.sys.mjs
@@ -0,0 +1,36 @@
+/* vim: set ts=2 sw=2 sts=2 et tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * The BrowserElementParent is for performing actions on one or more subframes of
+ * a <xul:browser> from the browser element binding.
+ */
+export class BrowserElementParent extends JSWindowActorParent {
+  receiveMessage(message) {
+    switch (message.name) {
+      case "DOMWindowClose": {
+        // This message is sent whenever window.close() is called within a window
+        // that had originally been opened via window.open. Double-check that this is
+        // coming from a top-level frame, and then dispatch the DOMWindowClose event
+        // on the browser so that the front-end code can do the right thing with the
+        // request to close.
+        if (!this.manager.browsingContext.parent) {
+          let browser = this.manager.browsingContext.embedderElement;
+          let win = browser.ownerGlobal;
+          // If this is a non-remote browser, the DOMWindowClose event will bubble
+          // up naturally, and doesn't need to be re-dispatched.
+          if (browser.isRemoteBrowser) {
+            browser.dispatchEvent(
+              new win.CustomEvent("DOMWindowClose", {
+                bubbles: true,
+              })
+            );
+          }
+        }
+        break;
+      }
+    }
+  }
+}