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index 0000000000..762353a06c
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+++ b/dom/l10n/tests/mochitest/l10n_mutations/test_set_attributes.html
@@ -0,0 +1,37 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test L10n Mutations for AttributeChange after DOMContentLoaded</title>
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+  <link rel="localization" href="crashreporter/aboutcrashes.ftl"/>
+  <link rel="localization" href="toolkit/about/aboutCompat.ftl"/>
+  <script type="application/javascript">
+  "use strict";
+  SimpleTest.waitForExplicitFinish();
+
+  document.addEventListener("DOMContentLoaded", async function() {
+    await document.l10n.ready;
+    let elem = document.getElementById("elem1");
+    let elem2 = document.getElementById("elem2");
+    is(elem.textContent.length, 0);
+    is(elem2.textContent.includes("Initial string"), true);
+    document.l10n.setAttributes(elem, "crash-reports-title");
+    elem2.setAttribute("data-l10n-args", JSON.stringify({bug: "New string"}));
+
+    let verifyL10n = () => {
+      if (elem.textContent.length && elem2.textContent.includes("New string")) {
+        window.removeEventListener("MozAfterPaint", verifyL10n);
+        SimpleTest.finish();
+      }
+    };
+    window.addEventListener("MozAfterPaint", verifyL10n);
+  });
+  </script>
+</head>
+<body>
+  <div id="elem1"></div>
+  <div id="elem2" data-l10n-id="label-more-information" data-l10n-args='{"bug":"Initial string"}'></div>
+</body>
+</html>