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diff --git a/devtools/client/webconsole/test/browser/test-csp-many-errors.html b/devtools/client/webconsole/test/browser/test-csp-many-errors.html
new file mode 100644
index 0000000000..52d05517c8
--- /dev/null
+++ b/devtools/client/webconsole/test/browser/test-csp-many-errors.html
@@ -0,0 +1,24 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>Test for Bug 1839165 - Verify that we warn about too many reports.</title>
+<!-- Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/ -->
+</head>
+<body>
+<div></div>
+<script>
+"use strict";
+
+function run() {
+  const div = document.querySelector("div");
+  // We limit the number of allowed CSP reports to 10.
+  for (let i = 0; i < 15; i++) {
+    div.setAttribute("style", `background-color: rgb(0, 0, ${i});`);
+  }
+}
+run();
+</script>
+</body>
+</html>