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diff --git a/toolkit/content/tests/browser/browser_datetime_datepicker_mousenav.js b/toolkit/content/tests/browser/browser_datetime_datepicker_mousenav.js
new file mode 100644
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+++ b/toolkit/content/tests/browser/browser_datetime_datepicker_mousenav.js
@@ -0,0 +1,248 @@
+/* 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/. */
+
+"use strict";
+
+const MONTH_YEAR = ".month-year",
+  DAYS_VIEW = ".days-view",
+  BTN_PREV_MONTH = ".prev",
+  BTN_NEXT_MONTH = ".next";
+const DATE_FORMAT = new Intl.DateTimeFormat("en-US", {
+  year: "numeric",
+  month: "long",
+  timeZone: "UTC",
+}).format;
+
+/**
+ * Helper function to find and return a gridcell element
+ * for a specific day of the month
+ *
+ * @param {Number} day: A day of the month to find in the month grid
+ *
+ * @return {HTMLElement} A gridcell that represents the needed day of the month
+ */
+function getDayEl(dayNum) {
+  const dayEls = Array.from(
+    helper.getElement(DAYS_VIEW).querySelectorAll("td")
+  );
+  return dayEls.find(el => el.textContent === dayNum.toString());
+}
+
+/**
+ * Helper function to find and return a gridcell element
+ * for a specific day of the month
+ *
+ * @return {Array[String]} TextContent of each gridcell within a calendar grid
+ */
+function getCalendarText() {
+  let calendarCells = [];
+  for (const tr of helper.getChildren(DAYS_VIEW)) {
+    for (const td of tr.children) {
+      calendarCells.push(td.textContent);
+    }
+  }
+  return calendarCells;
+}
+
+let helper = new DateTimeTestHelper();
+
+registerCleanupFunction(() => {
+  helper.cleanup();
+});
+
+/**
+ * When the previous month button is clicked, calendar should display the dates
+ * for the previous month.
+ */
+add_task(async function test_datepicker_prev_month_btn() {
+  const inputValue = "2016-12-15";
+  const prevMonth = "2016-11-01";
+
+  await helper.openPicker(
+    `data:text/html, <input type="date" value="${inputValue}">`
+  );
+
+  helper.click(helper.getElement(BTN_PREV_MONTH));
+
+  // 2016-11-15:
+  const focusableDay = getDayEl(15);
+
+  Assert.equal(
+    helper.getElement(MONTH_YEAR).textContent,
+    DATE_FORMAT(new Date(prevMonth))
+  );
+  Assert.deepEqual(
+    getCalendarText(),
+    [
+      "30",
+      "31",
+      "1",
+      "2",
+      "3",
+      "4",
+      "5",
+      "6",
+      "7",
+      "8",
+      "9",
+      "10",
+      "11",
+      "12",
+      "13",
+      "14",
+      "15",
+      "16",
+      "17",
+      "18",
+      "19",
+      "20",
+      "21",
+      "22",
+      "23",
+      "24",
+      "25",
+      "26",
+      "27",
+      "28",
+      "29",
+      "30",
+      "1",
+      "2",
+      "3",
+      "4",
+      "5",
+      "6",
+      "7",
+      "8",
+      "9",
+      "10",
+    ],
+    "2016-11"
+  );
+  Assert.equal(
+    focusableDay.textContent,
+    "15",
+    "The same day of the month is present within a calendar grid"
+  );
+  Assert.equal(
+    focusableDay,
+    helper.getElement(DAYS_VIEW).querySelector('[tabindex="0"]'),
+    "The same day of the month is focusable within a calendar grid"
+  );
+
+  await helper.tearDown();
+});
+
+/**
+ * When the next month button is clicked, calendar should display the dates for
+ * the next month.
+ */
+add_task(async function test_datepicker_next_month_btn() {
+  const inputValue = "2016-12-15";
+  const nextMonth = "2017-01-01";
+
+  await helper.openPicker(
+    `data:text/html, <input type="date" value="${inputValue}">`
+  );
+
+  helper.click(helper.getElement(BTN_NEXT_MONTH));
+
+  // 2017-01-15:
+  const focusableDay = getDayEl(15);
+
+  Assert.equal(
+    helper.getElement(MONTH_YEAR).textContent,
+    DATE_FORMAT(new Date(nextMonth))
+  );
+  Assert.deepEqual(
+    getCalendarText(),
+    [
+      "25",
+      "26",
+      "27",
+      "28",
+      "29",
+      "30",
+      "31",
+      "1",
+      "2",
+      "3",
+      "4",
+      "5",
+      "6",
+      "7",
+      "8",
+      "9",
+      "10",
+      "11",
+      "12",
+      "13",
+      "14",
+      "15",
+      "16",
+      "17",
+      "18",
+      "19",
+      "20",
+      "21",
+      "22",
+      "23",
+      "24",
+      "25",
+      "26",
+      "27",
+      "28",
+      "29",
+      "30",
+      "31",
+      "1",
+      "2",
+      "3",
+      "4",
+    ],
+    "2017-01"
+  );
+  Assert.equal(
+    focusableDay.textContent,
+    "15",
+    "The same day of the month is present within a calendar grid"
+  );
+  Assert.equal(
+    focusableDay,
+    helper.getElement(DAYS_VIEW).querySelector('[tabindex="0"]'),
+    "The same day of the month is focusable within a calendar grid"
+  );
+
+  await helper.tearDown();
+});
+
+/**
+ * When a date on the calendar is clicked, date picker should close and set
+ * value to the input box.
+ */
+add_task(async function test_datepicker_clicked() {
+  info("When a calendar day is clicked, the picker closes, the value is set");
+  const inputValue = "2016-12-15";
+  const firstDayOnCalendar = "2016-11-27";
+
+  await helper.openPicker(
+    `data:text/html, <input id="date" type="date" value="${inputValue}">`
+  );
+
+  let browser = helper.tab.linkedBrowser;
+  Assert.equal(helper.panel.state, "open", "Panel should be opened");
+
+  // Click the first item (top-left corner) of the calendar
+  let promise = BrowserTestUtils.waitForContentEvent(browser, "input");
+  helper.click(helper.getElement(DAYS_VIEW).querySelector("td"));
+  await promise;
+
+  let value = await SpecialPowers.spawn(browser, [], () => {
+    return content.document.querySelector("input").value;
+  });
+
+  Assert.equal(value, firstDayOnCalendar);
+
+  await helper.tearDown();
+});