index.extension.html

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<!doctype html>

<html lang="en">

  <head>

    <meta charset="UTF-8" />

    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <title>Upload with Thunderbird Send</title>

    <script type="module" crossorigin src="/extension.mjs"></script>

    <link rel="stylesheet" crossorigin href="/assets/extension.css">

  </head>

  <body>

    <div id="extension-page" class="w-full mx-auto px-4"></div>

  </body>

</html>