So apparently Chrome ships with an extension that is invisible to the user, can not be disabled and allows any *.google.com page to get detailed information about CPU and memory usage.

It is apparently at least 10 years old, was originally developed to debug Hangouts and people do claim that it is also shipped in Brave and Edge.

Who knows what else might be hidden in there!

Original Tweet: https://xcancel.com/lcasdev/status/1810696257137959018
Chrome Source: https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/resources/hangout_services/
Commit from October, 2013: https://github.com/chromium/chromium/commit/422c736b82e7ee763c67109cde700db81ca7b443