1 files changed, 72 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_slow_script.js b/browser/components/extensions/test/browser/browser_ext_slow_script.js
new file mode 100644
index 0000000000..bd9369a904
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_slow_script.js
@@ -0,0 +1,72 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+const DEFAULT_PROCESS_COUNT = Services.prefs
+  .getDefaultBranch(null)
+  .getIntPref("dom.ipc.processCount");
+
+add_task(async function test_slow_content_script() {
+  // Make sure we get a new process for our tab, or our reportProcessHangs
+  // preferences value won't apply to it.
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.ipc.processCount", 1],
+      ["dom.ipc.keepProcessesAlive.web", 0],
+    ],
+  });
+  await SpecialPowers.popPrefEnv();
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["dom.ipc.processCount", DEFAULT_PROCESS_COUNT * 2],
+      ["dom.ipc.processPrelaunch.enabled", false],
+      ["dom.ipc.reportProcessHangs", true],
+      ["dom.max_script_run_time.require_critical_input", false],
+    ],
+  });
+
+  let extension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "temporary",
+
+    manifest: {
+      name: "Slow Script Extension",
+
+      content_scripts: [
+        {
+          matches: ["http://example.com/"],
+          js: ["content.js"],
+        },
+      ],
+    },
+
+    files: {
+      "content.js": function () {
+        while (true) {
+          // Busy wait.
+        }
+      },
+    },
+  });
+
+  await extension.startup();
+
+  let alert = BrowserTestUtils.waitForGlobalNotificationBar(
+    window,
+    "process-hang"
+  );
+
+  BrowserTestUtils.openNewForegroundTab(gBrowser, "http://example.com/");
+
+  let notification = await alert;
+  let text = notification.messageText.textContent;
+
+  ok(text.includes("\u201cSlow Script Extension\u201d"), "Label is correct");
+
+  let stopButton = notification.buttonContainer.querySelector("[label='Stop']");
+  stopButton.click();
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  await extension.unload();
+});