1 files changed, 30 insertions, 0 deletions
diff --git a/toolkit/components/antitracking/test/browser/localStorageEvents.html b/toolkit/components/antitracking/test/browser/localStorageEvents.html
new file mode 100644
index 0000000000..737d1e0cab
--- /dev/null
+++ b/toolkit/components/antitracking/test/browser/localStorageEvents.html
@@ -0,0 +1,30 @@
+<script>
+
+let eventCounter = 0;
+
+onmessage = e => {
+  if (e.data == "getValue") {
+    parent.postMessage(localStorage.foo, "*");
+    return;
+  }
+
+  if (e.data == "setValue") {
+    localStorage.foo = "tracker-" + Math.random();
+    return;
+  }
+
+  if (e.data == "getEvents") {
+    parent.postMessage(eventCounter, "*");
+    return;
+  }
+
+  if (e.data == "reload") {
+    window.location.reload();
+  }
+};
+
+addEventListener("storage", _ => {
+  ++eventCounter;
+});
+
+</script>