1 files changed, 26 insertions, 0 deletions
diff --git a/browser/base/content/test/webextensions/browser_aboutaddons_blanktab.js b/browser/base/content/test/webextensions/browser_aboutaddons_blanktab.js
new file mode 100644
index 0000000000..228fe71815
--- /dev/null
+++ b/browser/base/content/test/webextensions/browser_aboutaddons_blanktab.js
@@ -0,0 +1,26 @@
+/* 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/. */
+
+add_task(async function testBlankTabReusedAboutAddons() {
+  await BrowserTestUtils.withNewTab({ gBrowser }, async browser => {
+    let tabCount = gBrowser.tabs.length;
+    is(browser, gBrowser.selectedBrowser, "New tab is selected");
+
+    // Opening about:addons shouldn't change the selected tab.
+    BrowserOpenAddonsMgr();
+
+    is(browser, gBrowser.selectedBrowser, "No new tab was opened");
+
+    // Wait for about:addons to load.
+    await BrowserTestUtils.browserLoaded(browser);
+
+    is(
+      browser.currentURI.spec,
+      "about:addons",
+      "about:addons should load into blank tab."
+    );
+
+    is(gBrowser.tabs.length, tabCount, "Still the same number of tabs");
+  });
+});