1 files changed, 24 insertions, 0 deletions
diff --git a/browser/components/messagepreview/messagepreview.js b/browser/components/messagepreview/messagepreview.js
new file mode 100644
index 0000000000..8748e98280
--- /dev/null
+++ b/browser/components/messagepreview/messagepreview.js
@@ -0,0 +1,24 @@
+/* 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/. */
+
+/* global MPShowMessage */
+
+"use strict";
+
+function decodeMessageFromUrl() {
+  const url = new URL(document.location.href);
+
+  if (url.searchParams.has("json")) {
+    const encodedMessage = url.searchParams.get("json");
+
+    return atob(encodedMessage);
+  }
+  return null;
+}
+
+const message = decodeMessageFromUrl();
+
+if (message) {
+  MPShowMessage(message);
+}