Comment by gruez
>1. Do I understand it correctly and the validation header is individual for each installation?
I'm not sure how you got that impression. It's generated from fixed constants.
https://github.com/dsekz/chrome-x-browser-validation-header?...
It's still not clear to me because it's called the default API key. And for me, default means that this is normally overwritten. And if overwritten, during build or during install? That's what I'm asking myself.