If you can’t listen to Crystal Radio by other means, try using the ‘web proxy’ method above.
The ‘Web Proxy’ link uses the same port (80) as your internet browser, so if you can see this page, you should be able to hear the station.
Some organizations ‘firewall’ ports that aren’t used for normal use. Crystal Radio streams on port 8000. So if it’s blocked by your internet provider, try the proxy link, it should work.