1 files changed, 29 insertions, 0 deletions
diff --git a/browser/components/resistfingerprinting/test/browser/file_hwconcurrency_iframee.html b/browser/components/resistfingerprinting/test/browser/file_hwconcurrency_iframee.html
new file mode 100644
index 0000000000..b66d97563c
--- /dev/null
+++ b/browser/components/resistfingerprinting/test/browser/file_hwconcurrency_iframee.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset="utf8">
+<script>
+var parent_window;
+let params = new URLSearchParams(document.location.search);
+if (params.get("mode") == "popup") {
+  parent_window = window.opener;
+} else {
+  parent_window = window.parent;
+}
+
+window.onload = async () => {
+  parent_window.postMessage("ready", "*");
+}
+
+window.addEventListener("message", async function listener(event) {
+  if (event.data[0] == "gimme") {
+    let result = give_result();
+    parent_window.postMessage(result, "*")
+  }
+});
+
+function give_result() {
+  return {
+      hardwareConcurrency : navigator.hardwareConcurrency
+    };
+}
+</script>
+<output id="result"></output>