Is overriding New tab page allowed?

App & System Services General Extensions wwdc20-10665

Created Mar ’21

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I've noticed the chrome_url_overrides is missing.
But is this on purpose? To NOT allow users to have custom new tab pages like in Opera?
Or is it just missing API which I can polyfill?

I could just react on new tab being created and replace it with my extension page. But is it allowed?

Thanks!

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