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diff --git a/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js b/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js
new file mode 100644
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+++ b/toolkit/mozapps/downloads/tests/unit/test_lowMinutes.js
@@ -0,0 +1,56 @@
+/* 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/. */
+
+/**
+ * Test bug 448344 to make sure when we're in low minutes, we show both minutes
+ * and seconds; but continue to show only minutes when we have plenty.
+ */
+
+const { DownloadUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/DownloadUtils.sys.mjs"
+);
+
+/**
+ * Print some debug message to the console. All arguments will be printed,
+ * separated by spaces.
+ *
+ * @param [arg0, arg1, arg2, ...]
+ *        Any number of arguments to print out
+ * @usage _("Hello World") -> prints "Hello World"
+ * @usage _(1, 2, 3) -> prints "1 2 3"
+ */
+var _ = function (some, debug, text, to) {
+  print(Array.from(arguments).join(" "));
+};
+
+_("Make an array of time lefts and expected string to be shown for that time");
+var expectedTimes = [
+  [1.1, "A few seconds left", "under 4sec -> few"],
+  [2.5, "A few seconds left", "under 4sec -> few"],
+  [3.9, "A few seconds left", "under 4sec -> few"],
+  [5.3, "5s left", "truncate seconds"],
+  [1.1 * 60, "1m 6s left", "under 4min -> show sec"],
+  [2.5 * 60, "2m 30s left", "under 4min -> show sec"],
+  [3.9 * 60, "3m 54s left", "under 4min -> show sec"],
+  [5.3 * 60, "5m left", "over 4min -> only show min"],
+  [1.1 * 3600, "1h 6m left", "over 1hr -> show min/sec"],
+  [2.5 * 3600, "2h 30m left", "over 1hr -> show min/sec"],
+  [3.9 * 3600, "3h 54m left", "over 1hr -> show min/sec"],
+  [5.3 * 3600, "5h 18m left", "over 1hr -> show min/sec"],
+];
+_(expectedTimes.join("\n"));
+
+function run_test() {
+  expectedTimes.forEach(function ([time, expectStatus, comment]) {
+    _("Running test with time", time);
+    _("Test comment:", comment);
+    let [status, last] = DownloadUtils.getTimeLeft(time);
+
+    _("Got status:", status, "last:", last);
+    _("Expecting..", expectStatus);
+    Assert.equal(status, expectStatus);
+
+    _();
+  });
+}