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diff --git a/dom/manifest/test/test_ManifestProcessor_display.html b/dom/manifest/test/test_ManifestProcessor_display.html
new file mode 100644
index 0000000000..f5ea5fbc4f
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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 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>