1 files changed, 34 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/browser/browser_preloaded_newtab.js b/devtools/client/responsive/test/browser/browser_preloaded_newtab.js
new file mode 100644
index 0000000000..bda4ada24d
--- /dev/null
+++ b/devtools/client/responsive/test/browser/browser_preloaded_newtab.js
@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Verify RDM opens for a preloaded about:newtab browser.
+
+const TEST_URL = "https://example.com/";
+
+addRDMTask(
+  null,
+  async function () {
+    const preloadedBrowser = gBrowser.preloadedBrowser;
+
+    // Open a tab with about:newtab.
+    // Don't wait for load because the page is preloaded.
+    const tab = await addTab(BROWSER_NEW_TAB_URL, {
+      waitForLoad: false,
+    });
+    const browser = tab.linkedBrowser;
+    is(browser, preloadedBrowser, "Got a preloaded browser for newtab");
+
+    // Open RDM and try to navigate
+    const { ui } = await openRDM(tab);
+    await waitForDeviceAndViewportState(ui);
+
+    await navigateTo(TEST_URL);
+    ok(true, "Test URL navigated successfully");
+
+    await closeRDM(tab);
+    await removeTab(tab);
+  },
+  { onlyPrefAndTask: true }
+);