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installing the native app version: http://www.espruino.com/Web+IDE#as-a-native-application
It works! Thanks for the answer. I think it would be usefull to include this to the Troubleshooting page.
Sadly, yes. I think it's possible that they could have disabled access to the
chrome.serialAPI as part of a corporate security lockdown.
I guess you could give https://www.espruino.com/ide/ a go and see if it's any better. You could also try installing the native app version: http://www.espruino.com/Web+IDE#as-a-native-application