1 files changed, 40 insertions, 0 deletions
diff --git a/toolkit/components/extensions/child/ext-backgroundPage.js b/toolkit/components/extensions/child/ext-backgroundPage.js
new file mode 100644
index 0000000000..ef5b3dd339
--- /dev/null
+++ b/toolkit/components/extensions/child/ext-backgroundPage.js
@@ -0,0 +1,40 @@
+/* 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/. */
+
+"use strict";
+
+this.backgroundPage = class extends ExtensionAPI {
+  getAPI(context) {
+    function getBackgroundPage() {
+      for (let view of context.extension.views) {
+        if (
+          // To find the (top-level) background context, this logic relies on
+          // the order of views, implied by the fact that the top-level context
+          // is created before child contexts. If this assumption ever becomes
+          // invalid, add a check for view.isBackgroundContext.
+          view.viewType == "background" &&
+          context.principal.subsumes(view.principal)
+        ) {
+          return view.contentWindow;
+        }
+      }
+      return null;
+    }
+    return {
+      extension: {
+        getBackgroundPage,
+      },
+
+      runtime: {
+        getBackgroundPage() {
+          return context.childManager
+            .callParentAsyncFunction("runtime.internalWakeupBackground", [])
+            .then(() => {
+              return context.cloneScope.Promise.resolve(getBackgroundPage());
+            });
+        },
+      },
+    };
+  }
+};