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diff --git a/dom/manifest/test/test_ManifestProcessor_dir.html b/dom/manifest/test/test_ManifestProcessor_dir.html
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index 0000000000..b5dc84a9e4
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+++ b/dom/manifest/test/test_ManifestProcessor_dir.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1258899
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1258899</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>
+/**
+ * dir member
+ * https://w3c.github.io/manifest/#dir-member
+ **/
+"use strict";
+// Type checks
+typeTests.forEach((type) => {
+  var expected = `Expect non - string dir to default to "auto".`;
+  data.jsonText = JSON.stringify({
+    dir: type,
+  });
+  var result = processor.process(data);
+  is(result.dir, "auto", expected);
+});
+
+/* Test valid values*/
+var validDirs = ["ltr", "rtl", "auto"];
+validDirs.forEach((dir) => {
+  var expected = `Expect dir value to be ${dir}.`;
+  data.jsonText = JSON.stringify({dir});
+  var result = processor.process(data);
+  is(result.dir, dir, expected);
+});
+
+// trim tests
+validDirs.forEach((dir) => {
+  var expected = `Expect trimmed dir to be returned.`;
+  var expandeddir =  seperators + lineTerminators + dir + lineTerminators + seperators;
+  data.jsonText = JSON.stringify({
+    dir: expandeddir,
+  });
+  var result = processor.process(data);
+  is(result.dir, dir, expected);
+});
+
+// Unknown/Invalid directions
+var invalidDirs = ["LTR", "RtL", `fooo${whiteSpace}rtl`, "", "bar baz, some value", "ltr rtl auto", "AuTo"];
+invalidDirs.forEach((dir) => {
+  var expected = `Expect default dir "auto" to be returned: '${dir}'`;
+  data.jsonText = JSON.stringify({dir});
+  var result = processor.process(data);
+  is(result.dir, "auto", expected);
+});
+  </script>
+</head>