I want import https://npm.devtool.tech/cdn/@solana/spl-token for my google extension

<script src="https://unpkg.com/@solana/web3.js@latest/lib/index.iife.min.js"></script>
<script src="https://unpkg.com/@solana/spl-token"></script>

Web3.js is working fine. But SPL-Token raise Exception:

Uncaught ReferenceError: exports is not defined
    at spl-token:12:23

I tried another CDNs, but all to no avail.