1 files changed, 35 insertions, 0 deletions
diff --git a/toolkit/actors/BrowserElementChild.sys.mjs b/toolkit/actors/BrowserElementChild.sys.mjs
new file mode 100644
index 0000000000..97e1327821
--- /dev/null
+++ b/toolkit/actors/BrowserElementChild.sys.mjs
@@ -0,0 +1,35 @@
+/* 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/. */
+
+export class BrowserElementChild extends JSWindowActorChild {
+  handleEvent(event) {
+    if (
+      event.type == "DOMWindowClose" &&
+      !this.manager.browsingContext.parent
+    ) {
+      this.sendAsyncMessage("DOMWindowClose", {});
+    }
+  }
+
+  receiveMessage(message) {
+    switch (message.name) {
+      case "EnterModalState": {
+        this.contentWindow.windowUtils.enterModalState();
+        break;
+      }
+
+      case "LeaveModalState": {
+        if (
+          !message.data.forceLeave &&
+          !this.contentWindow.windowUtils.isInModalState()
+        ) {
+          break;
+        }
+        this.contentWindow.windowUtils.leaveModalState();
+        break;
+      }
+    }
+  }
+}