1 files changed, 23 insertions, 0 deletions
diff --git a/browser/extensions/screenshots/makeUuid.js b/browser/extensions/screenshots/makeUuid.js
new file mode 100644
index 0000000000..7ae77299e4
--- /dev/null
+++ b/browser/extensions/screenshots/makeUuid.js
@@ -0,0 +1,23 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+this.makeUuid = (function() {
+
+  // generates a v4 UUID
+  return function makeUuid() { // eslint-disable-line no-unused-vars
+    // get sixteen unsigned 8 bit random values
+    const randomValues = window
+      .crypto
+      .getRandomValues(new Uint8Array(36));
+
+    return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, function(c) {
+      const i = Array.prototype.slice.call(arguments).slice(-2)[0]; // grab the `offset` parameter
+      const r = randomValues[i] % 16|0, v = c === "x" ? r : (r & 0x3 | 0x8);
+      return v.toString(16);
+    });
+  };
+})();
+null;