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diff --git a/dom/manifest/test/test_ManifestProcessor_orientation.html b/dom/manifest/test/test_ManifestProcessor_orientation.html
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index 0000000000..9333eecbe3
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+++ b/dom/manifest/test/test_ManifestProcessor_orientation.html
@@ -0,0 +1,86 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1079453
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1079453</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script src="common.js"></script>
+  <script>
+/**
+ * orientation member
+ * https://w3c.github.io/manifest/#orientation-member
+ **/
+"use strict";
+
+typeTests.forEach((type) => {
+  var expected = `Expect non-string orientation to be empty string : ${typeof type}.`;
+  data.jsonText = JSON.stringify({
+    orientation: type,
+  });
+  var result = processor.process(data);
+  is(result.orientation, undefined, expected);
+});
+
+var validOrientations = [
+  "any",
+  "natural",
+  "landscape",
+  "portrait",
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary",
+  "aNy",
+  "NaTuRal",
+  "LANDsCAPE",
+  "PORTRAIT",
+  "portrait-PRIMARY",
+  "portrait-SECONDARY",
+  "LANDSCAPE-primary",
+  "LANDSCAPE-secondary",
+];
+
+validOrientations.forEach((orientation) => {
+  var expected = `Expect orientation to be returned: ${orientation}.`;
+  data.jsonText = JSON.stringify({ orientation });
+  var result = processor.process(data);
+  is(result.orientation, orientation.toLowerCase(), expected);
+});
+
+var invalidOrientations = [
+  "all",
+  "ANYMany",
+  "NaTuRalle",
+  "portrait-primary portrait-secondary",
+  "portrait-primary,portrait-secondary",
+  "any-natural",
+  "portrait-landscape",
+  "primary-portrait",
+  "secondary-portrait",
+  "landscape-landscape",
+  "secondary-primary",
+];
+
+invalidOrientations.forEach((orientation) => {
+  var expected = `Expect orientation to be empty string: ${orientation}.`;
+  data.jsonText = JSON.stringify({ orientation });
+  var result = processor.process(data);
+  is(result.orientation, undefined, expected);
+});
+
+// Trim tests
+validOrientations.forEach((orientation) => {
+  var expected = `Expect trimmed orientation to be returned.`;
+  var expandedOrientation = `${seperators}${lineTerminators}${orientation}${lineTerminators}${seperators}`;
+  data.jsonText = JSON.stringify({
+    orientation: expandedOrientation,
+  });
+  var result = processor.process(data);
+  is(result.orientation, orientation.toLowerCase(), expected);
+});
+  </script>
+</head>