1 files changed, 41 insertions, 0 deletions
diff --git a/toolkit/components/resistfingerprinting/content/usercharacteristics.js b/toolkit/components/resistfingerprinting/content/usercharacteristics.js
new file mode 100644
index 0000000000..1f10ba9cbb
--- /dev/null
+++ b/toolkit/components/resistfingerprinting/content/usercharacteristics.js
@@ -0,0 +1,41 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+var debugMsgs = [];
+function debug(...args) {
+  let msg = "";
+  if (!args.length) {
+    debugMsgs.push("");
+    return;
+  }
+
+  let stringify = o => {
+    if (typeof o == "string") {
+      return o;
+    }
+    return JSON.stringify(o);
+  };
+
+  let stringifiedArgs = args.map(stringify);
+  msg += stringifiedArgs.join(" ");
+  debugMsgs.push(msg);
+}
+
+debug("Debug Line");
+debug("Another debug line, with", { an: "object" });
+
+// The first time we put a real value in here, please update browser_usercharacteristics.js
+let output = {
+  foo: "Hello World",
+};
+
+document.dispatchEvent(
+  new CustomEvent("UserCharacteristicsDataDone", {
+    bubbles: true,
+    detail: {
+      debug: debugMsgs,
+      output,
+    },
+  })
+);