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diff --git a/dom/events/test/test_legacy_non-primary_click.html b/dom/events/test/test_legacy_non-primary_click.html
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+++ b/dom/events/test/test_legacy_non-primary_click.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for dispatching of legacy non-primary click when domain in pref</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<a id="link-test" href="example.org">example link</a>
+<script>
+"use strict";
+SimpleTest.waitForExplicitFinish();
+
+const HACK_PREF = "dom.mouseevent.click.hack.use_legacy_non-primary_dispatch";
+const testEl = document.getElementById("test");
+const linkEl = document.getElementById("link-test");
+let seenClick = false;
+
+SpecialPowers.pushPrefEnv(
+  { set: [[HACK_PREF, document.domain]] },
+  () => {
+    SimpleTest.waitForFocus(() => {
+      // Test seeing the non-primary 'click'
+      document.addEventListener("click", (e) => {
+        ok(true, "Saw 'click' event");
+        seenClick = true;
+      }, { once: true });
+      document.addEventListener("auxclick", (e) => {
+        ok(true, "Saw 'auxclick' event");
+        ok(seenClick, "Saw 'click' event before 'auxclick' event");
+      }, { once: true });
+      synthesizeMouseAtCenter(testEl, { button: 1 });
+
+      // Test preventDefaulting on non-primary 'click'
+      document.addEventListener("click", (e) => {
+        is(e.target, linkEl, "Saw 'click' on link");
+        e.preventDefault();
+        SimpleTest.finish();
+      }, { once: true, capture: true });
+      document.addEventListener("auxclick", (e) => {
+        ok(false, "Shouldn't have got 'auxclick' after preventDefaulting 'click'");
+      }, { once: true });
+      synthesizeMouseAtCenter(linkEl, { button: 1 });
+    });
+  });
+</script>
+</body>
+</html>