1 files changed, 55 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_tab_manager_visibility.js b/browser/base/content/test/tabs/browser_tab_manager_visibility.js
new file mode 100644
index 0000000000..cfec0fa528
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_tab_manager_visibility.js
@@ -0,0 +1,55 @@
+/**
+ * Test the Tab Manager visibility respects browser.tabs.tabmanager.enabled preference
+ *  */
+
+"use strict";
+
+// The hostname for the test URIs.
+const TEST_HOSTNAME = "https://example.com";
+const DUMMY_PAGE_PATH = "/browser/base/content/test/tabs/dummy_page.html";
+
+add_task(async function tab_manager_visibility_preference_on() {
+  Services.prefs.setBoolPref("browser.tabs.tabmanager.enabled", true);
+
+  let newWindow =
+    await BrowserTestUtils.openNewWindowWithFlushedCacheForMozSupports();
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser: newWindow.gBrowser,
+      url: TEST_HOSTNAME + DUMMY_PAGE_PATH,
+    },
+    async function (browser) {
+      await Assert.ok(
+        BrowserTestUtils.is_visible(
+          newWindow.document.getElementById("alltabs-button")
+        ),
+        "tab manage menu is visible when browser.tabs.tabmanager.enabled preference is set to true"
+      );
+    }
+  );
+  Services.prefs.clearUserPref("browser.tabs.tabmanager.enabled");
+  BrowserTestUtils.closeWindow(newWindow);
+});
+
+add_task(async function tab_manager_visibility_preference_off() {
+  Services.prefs.setBoolPref("browser.tabs.tabmanager.enabled", false);
+
+  let newWindow =
+    await BrowserTestUtils.openNewWindowWithFlushedCacheForMozSupports();
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser: newWindow.gBrowser,
+      url: TEST_HOSTNAME + DUMMY_PAGE_PATH,
+    },
+    async function (browser) {
+      await Assert.ok(
+        BrowserTestUtils.is_hidden(
+          newWindow.document.getElementById("alltabs-button")
+        ),
+        "tab manage menu is hidden when browser.tabs.tabmanager.enabled preference is set to true"
+      );
+    }
+  );
+  Services.prefs.clearUserPref("browser.tabs.tabmanager.enabled");
+  BrowserTestUtils.closeWindow(newWindow);
+});