1 files changed, 43 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_webNavigation_frameId0.js b/browser/components/extensions/test/browser/browser_ext_webNavigation_frameId0.js
new file mode 100644
index 0000000000..c5b2c72778
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_webNavigation_frameId0.js
@@ -0,0 +1,43 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+add_task(async function webNavigation_getFrameId_of_existing_main_frame() {
+  const BASE =
+    "http://mochi.test:8888/browser/browser/components/extensions/test/browser/";
+  const DUMMY_URL = BASE + "file_dummy.html";
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    DUMMY_URL,
+    true
+  );
+
+  async function background(DUMMY_URL) {
+    let tabs = await browser.tabs.query({ active: true, currentWindow: true });
+    let frames = await browser.webNavigation.getAllFrames({
+      tabId: tabs[0].id,
+    });
+    browser.test.assertEq(1, frames.length, "The dummy page has one frame");
+    browser.test.assertEq(0, frames[0].frameId, "Main frame's ID must be 0");
+    browser.test.assertEq(
+      DUMMY_URL,
+      frames[0].url,
+      "Main frame URL must match"
+    );
+    browser.test.notifyPass("frameId checked");
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      permissions: ["webNavigation"],
+    },
+
+    background: `(${background})(${JSON.stringify(DUMMY_URL)});`,
+  });
+
+  await extension.startup();
+  await extension.awaitFinish("frameId checked");
+  await extension.unload();
+
+  BrowserTestUtils.removeTab(tab);
+});