It turns out Google Chrome (via Chromium) includes a default extension which makes extra services available to code running on the `*.google.com` domains - tweeted about today [by Luca Casonato](https://twitter.com/lcasdev/status/1810696257137959018), …
I agree, but… This was in open source software. Chromium. Not just Google Chrome. https://github.com/chromium/chromium/commit/422c736b82e7ee763c67109cde700db81ca7b443