Cannot Access Lichess on Institute Network

When I try to access lichess.org on my institute network it says the following error.
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The owner of lichess.org has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.
"""

Your institute network may use a MITM proxy to intercept secure traffic. This means your connection to lichess is insecure, so Firefox won't allow it, which is what it's supposed to do.

I'm not sure about your institute network policy, but assuming you can't ask them to change it, you have limited options:
- Try using a VPN
- Use a different network