1 files changed, 34 insertions, 0 deletions
diff --git a/browser/components/resistfingerprinting/test/browser/file_reduceTimePrecision_iframe_worker.sjs b/browser/components/resistfingerprinting/test/browser/file_reduceTimePrecision_iframe_worker.sjs
new file mode 100644
index 0000000000..7791c05c06
--- /dev/null
+++ b/browser/components/resistfingerprinting/test/browser/file_reduceTimePrecision_iframe_worker.sjs
@@ -0,0 +1,34 @@
+"use strict";
+
+function handleRequest(request, response) {
+  response.setHeader("Content-Type", "application/javascript");
+
+  let content = `onconnect = function(e) {
+    let port = e.ports[0];
+
+    let navigatorObj = self.navigator;
+    let result = [];
+
+    // Known ways to generate time stamps, in milliseconds
+    const timeStampCodes = [
+      'performance.now()',
+      'new Date().getTime()',
+      'new Event("").timeStamp',
+      'new File([], "").lastModified',
+    ];
+
+    for (let timeStampCode of timeStampCodes) {
+      let timeStamp = eval(timeStampCode);
+
+      result.push({
+        'name': 'worker ' + timeStampCode,
+        'value': timeStamp
+      });
+    }
+
+    port.postMessage(result);
+    port.start();
+  };`;
+
+  response.write(content);
+}