1 files changed, 64 insertions, 0 deletions
diff --git a/layout/base/tests/browser_disableDialogs_onbeforeunload.js b/layout/base/tests/browser_disableDialogs_onbeforeunload.js
new file mode 100644
index 0000000000..f060d1db51
--- /dev/null
+++ b/layout/base/tests/browser_disableDialogs_onbeforeunload.js
@@ -0,0 +1,64 @@
+const { PromptTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromptTestUtils.sys.mjs"
+);
+
+function pageScript() {
+  window.addEventListener(
+    "beforeunload",
+    function (event) {
+      var str = "Some text that causes the beforeunload dialog to be shown";
+      event.returnValue = str;
+      return str;
+    },
+    true
+  );
+}
+
+SpecialPowers.pushPrefEnv({
+  set: [["dom.require_user_interaction_for_beforeunload", false]],
+});
+
+const PAGE_URL =
+  "data:text/html," +
+  encodeURIComponent("<script>(" + pageScript.toSource() + ")();</script>");
+
+add_task(async function enableDialogs() {
+  // The onbeforeunload dialog should appear.
+  let dialogPromise = PromptTestUtils.waitForPrompt(null, {
+    modalType: Services.prompt.MODAL_TYPE_CONTENT,
+    promptType: "confirmEx",
+  });
+
+  let openPagePromise = openPage(true);
+  let dialog = await dialogPromise;
+  Assert.ok(true, "Showed the beforeunload dialog.");
+
+  await PromptTestUtils.handlePrompt(dialog, { buttonNumClick: 0 });
+  await openPagePromise;
+});
+
+add_task(async function disableDialogs() {
+  // The onbeforeunload dialog should NOT appear.
+  await openPage(false);
+  info("If we time out here, then the dialog was shown...");
+});
+
+async function openPage(enableDialogs) {
+  // Open about:blank in a new tab.
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:blank" },
+    async function (browser) {
+      // Load the page.
+      BrowserTestUtils.startLoadingURIString(browser, PAGE_URL);
+      await BrowserTestUtils.browserLoaded(browser);
+      // Load the content script in the frame.
+      let methodName = enableDialogs ? "enableDialogs" : "disableDialogs";
+      await SpecialPowers.spawn(browser, [methodName], async function (name) {
+        content.windowUtils[name]();
+      });
+      // And then navigate away.
+      BrowserTestUtils.startLoadingURIString(browser, "http://example.com/");
+      await BrowserTestUtils.browserLoaded(browser);
+    }
+  );
+}