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diff --git a/caps/tests/mochitest/test_addonMayLoad.html b/caps/tests/mochitest/test_addonMayLoad.html
new file mode 100644
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+++ b/caps/tests/mochitest/test_addonMayLoad.html
@@ -0,0 +1,95 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1180921
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1180921</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug 1180921 **/
+  let module = Cu.getGlobalForObject(Services);
+  let ssm = Services.scriptSecurityManager;
+
+  function StubPolicy(id, subdomain) {
+    /* globals MatchPatternSet */
+    return new module.WebExtensionPolicy({
+      id,
+      mozExtensionHostname: id,
+      baseURL: `file:///{id}`,
+
+      allowedOrigins: new MatchPatternSet([`*://${subdomain}.example.org/*`]),
+      localizeCallback(string) {},
+    });
+  }
+
+  /* globals WebExtensionPolicy */
+  let policyA = StubPolicy("addona", "test1");
+  let policyB = StubPolicy("addonb", "test2");
+  policyA.active = true;
+  policyB.active = true;
+
+  SimpleTest.waitForExplicitFinish();
+  SimpleTest.registerCleanupFunction(function() {
+    policyA.active = false;
+    policyB.active = false;
+  });
+
+  function tryLoad(sb, uri) {
+    let p = new Promise(function(resolve, reject) {
+      Cu.exportFunction(resolve, sb, { defineAs: "finish" });
+      Cu.exportFunction(reject, sb, { defineAs: "error" });
+      sb.eval("try { (function () { " +
+              "  var xhr = new XMLHttpRequest();" +
+              "  xhr.onreadystatechange = function() { if (xhr.readyState == XMLHttpRequest.DONE) { finish(xhr.status == 200); } };" +
+              "  xhr.open('GET', '" + uri + "', true);" +
+              "  xhr.send();" +
+              "})() } catch (e) { error(e); }");
+    });
+    return p;
+  }
+
+  let addonA = new Cu.Sandbox(ssm.createContentPrincipal(Services.io.newURI("moz-extension://addonA/"), {}),
+                              {wantGlobalProperties: ["XMLHttpRequest"]});
+  let addonB = new Cu.Sandbox(ssm.createContentPrincipal(Services.io.newURI("moz-extension://addonB/"), {}),
+                              {wantGlobalProperties: ["XMLHttpRequest"]});
+
+  function uriForDomain(d) { return d + "/tests/caps/tests/mochitest/file_data.txt"; }
+
+  tryLoad(addonA, uriForDomain("http://test4.example.org"))
+  .then(function(success) {
+    ok(!success, "cross-origin load should fail for addon A");
+    return tryLoad(addonA, uriForDomain("http://test1.example.org"));
+  }).then(function(success) {
+    ok(success, "allowlisted cross-origin load of test1 should succeed for addon A");
+    return tryLoad(addonB, uriForDomain("http://test1.example.org"));
+  }).then(function(success) {
+    ok(!success, "non-allowlisted cross-origin load of test1 should fail for addon B");
+    return tryLoad(addonB, uriForDomain("http://test2.example.org"));
+  }).then(function(success) {
+    ok(success, "allowlisted cross-origin load of test2 should succeed for addon B");
+    return tryLoad(addonA, uriForDomain("http://test2.example.org"));
+  }).then(function(success) {
+    ok(!success, "non-allowlisted cross-origin load of test2 should fail for addon A");
+    SimpleTest.finish();
+  }, function(e) {
+    ok(false, "Rejected promise chain: " + e);
+    SimpleTest.finish();
+  });
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1180921">Mozilla Bug 1180921</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>