--- a/browser/components/resistfingerprinting/test/browser/browser.ini
+++ b/browser/components/resistfingerprinting/test/browser/browser.ini
@@ -7,8 +7,9 @@ support-files =
 [browser_roundedWindow_dialogWindow.js]
 [browser_roundedWindow_newWindow.js]
 [browser_roundedWindow_open_max.js]
 [browser_roundedWindow_open_mid.js]
 [browser_roundedWindow_open_min.js]
 [browser_roundedWindow_windowSetting_max.js]
 [browser_roundedWindow_windowSetting_mid.js]
 [browser_roundedWindow_windowSetting_min.js]
+[browser_timezone.js]

new file mode 100644
--- /dev/null
+++ b/browser/components/resistfingerprinting/test/browser/browser_timezone.js
@@ -0,0 +1,38 @@
+/**
+ * Bug 1330890 - A test case for verifying Date() object of javascript will use
+ *               UTC timezone after fingerprinting resistance is enabled.
+ */
+
+const TEST_DOMAIN = "http://example.net/";
+const TEST_PATH = TEST_DOMAIN + "browser/browser/components/resistFingerprinting/test/browser/";
+
+add_task(function* setup() {
+  yield SpecialPowers.pushPrefEnv({"set":
+    [["privacy.resistFingerprinting", true]]
+  });
+});
+
+add_task(function* test_timezone() {
+  // Load a page and verify the timezone.
+  let tab = yield BrowserTestUtils.openNewForegroundTab(
+    gBrowser, TEST_PATH + "file_dummy.html");
+
+  yield ContentTask.spawn(tab.linkedBrowser, null,
+    function* () {
+      let dateObj = new Date();
+      let dateString = dateObj.toString();
+
+      ok(dateString.endsWith("(UTC)"), "The date string is in UTC timezone.");
+      is(dateObj.getFullYear(), dateObj.getUTCFullYear(),
+           "The full year reports in UTC timezone.");
+      is(dateObj.getMonth(), dateObj.getUTCMonth(), "The month reports in UTC timezone.");
+      is(dateObj.getDate(), dateObj.getUTCDate(), "The month reports in UTC timezone.");
+      is(dateObj.getDay(), dateObj.getUTCDay(), "The day reports in UTC timezone.");
+      is(dateObj.getHours(), dateObj.getUTCHours(), "The hours reports in UTC timezone.");
+      is(dateObj.getTimezoneOffset(), 0, "The difference with UTC timezone is 0.");
+
+    }
+  );
+
+  yield BrowserTestUtils.removeTab(tab);
+});