1 files changed, 10 insertions, 0 deletions
diff --git a/browser/components/resistfingerprinting/test/browser/shared_test_funcs.js b/browser/components/resistfingerprinting/test/browser/shared_test_funcs.js
new file mode 100644
index 0000000000..0949ef5848
--- /dev/null
+++ b/browser/components/resistfingerprinting/test/browser/shared_test_funcs.js
@@ -0,0 +1,10 @@
+function waitForMessage(aMsg, aOrigin) {
+  return new Promise(resolve => {
+    window.addEventListener("message", function listener(event) {
+      if (event.data == aMsg && (aOrigin == "*" || event.origin == aOrigin)) {
+        window.removeEventListener("message", listener);
+        resolve();
+      }
+    });
+  });
+}