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diff --git a/dom/manifest/test/test_ManifestProcessor_display.html b/dom/manifest/test/test_ManifestProcessor_display.html
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index 000000000..10106465a
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+++ b/dom/manifest/test/test_ManifestProcessor_display.html
@@ -0,0 +1,78 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1079453
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1079453</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script src="common.js"></script>
+  <script>
+/**
+ * display member
+ * https://w3c.github.io/manifest/#display-member
+ **/
+'use strict';
+//Type checks
+typeTests.forEach((type) => {
+  var expected = `Expect non - string display to default to "browser".`;
+  data.jsonText = JSON.stringify({
+    display: type
+  });
+  var result = processor.process(data);
+  is(result.display, 'browser', expected);
+});
+
+/*Test valid modes - case insensitive*/
+var validModes = [
+  'fullscreen',
+  'standalone',
+  'minimal-ui',
+  'browser',
+  'FullScreen',
+  'standAlone',
+  'minimal-UI',
+  'BROWSER',
+]
+validModes.forEach((mode) => {
+  var expected = `Expect display mode to be ${mode.toLowerCase()}.`;
+  data.jsonText = JSON.stringify({
+    display: mode
+  });
+  var result = processor.process(data);
+  is(result.display, mode.toLowerCase(), expected);
+});
+
+//trim tests
+validModes.forEach((display) => {
+  var expected = `Expect trimmed display mode to be returned.`;
+  var expandedDisplay =  seperators + lineTerminators + display + lineTerminators + seperators;
+  data.jsonText = JSON.stringify({
+    display: expandedDisplay
+  });
+  var result = processor.process(data);
+  is(result.display, display.toLowerCase(), expected);
+});
+
+//Unknown modes
+var invalidModes = [
+  'foo',
+  `fooo${whiteSpace}`,
+  '',
+  'fullscreen,standalone',
+  'standalone fullscreen',
+  'FULLSCreENS',
+];
+
+invalidModes.forEach((invalidMode) => {
+  var expected = `Expect default display mode "browser" to be returned: '${invalidMode}'`;
+  data.jsonText = JSON.stringify({
+    display: invalidMode
+  });
+  var result = processor.process(data);
+  is(result.display, 'browser', expected);
+});
+  </script>
+</head>