1 files changed, 49 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_tabs_lazy.js b/browser/components/extensions/test/browser/browser_ext_tabs_lazy.js
new file mode 100644
index 0000000000..68205089d5
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_tabs_lazy.js
@@ -0,0 +1,49 @@
+"use strict";
+
+const triggeringPrincipal_base64 = E10SUtils.SERIALIZED_SYSTEMPRINCIPAL;
+
+const SESSION = {
+  windows: [
+    {
+      tabs: [
+        { entries: [{ url: "about:blank", triggeringPrincipal_base64 }] },
+        {
+          entries: [
+            { url: "https://example.com/", triggeringPrincipal_base64 },
+          ],
+        },
+      ],
+    },
+  ],
+};
+
+add_task(async function () {
+  SessionStore.setBrowserState(JSON.stringify(SESSION));
+  await promiseWindowRestored(window);
+  const tab = gBrowser.tabs[1];
+
+  is(tab.getAttribute("pending"), "true", "The tab is pending restore");
+  is(tab.linkedBrowser.isConnected, false, "The tab is lazy");
+
+  async function background() {
+    const [tab] = await browser.tabs.query({ url: "https://example.com/" });
+    browser.test.assertRejects(
+      browser.tabs.sendMessage(tab.id, "void"),
+      /Could not establish connection. Receiving end does not exist/,
+      "No recievers in a tab pending restore."
+    );
+    browser.test.notifyPass("lazy");
+  }
+
+  const manifest = { permissions: ["tabs"] };
+  const extension = ExtensionTestUtils.loadExtension({ manifest, background });
+
+  await extension.startup();
+  await extension.awaitFinish("lazy");
+  await extension.unload();
+
+  is(tab.getAttribute("pending"), "true", "The tab is still pending restore");
+  is(tab.linkedBrowser.isConnected, false, "The tab is still lazy");
+
+  BrowserTestUtils.removeTab(tab);
+});