firefox/devtools/client/styleeditor/test/doc_sourcemap_chrome.html

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>Testcase for sourcemap URLs pointing to unsupported protocols</title>
  <link rel="stylesheet" type="text/css" href="sourcemap-css/sourcemaps_chrome.css"/>
</head>
<body>
  <div>Protocol test</div>
</body>
</html>