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When the Google login screen opens I get this in the JavaScript console:
Refused to execute a script because its hash, its nonce, or 'unsafe-inline' does not appear in the script-src directive of the Content Security Policy.Discussions regarding this common problem with Safari and possible workaround (disabling popups and cross-site tracking) discussed here https://github.com/google/google-api-javascript-client/issues/397
Sorry, only seeing this now.
That's a long page! I'm not sure what would fix it. And I don't have Safari to test on.
But if you find any code you can add to this script, to make it work, I will happily add it to the script!