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Google tries to defend its Web Environment Integrity
(techreport.com)
This is a most excellent place for technology news and articles.
From my very basic understanding of it yes. It in effect checks what's loaded against what was served and if there's a discrepancy it does its thing.
Note. If I have misunderstood please someone correct me.
Is there anything that would prevent some kind of proxy stripper? I'm thinking something that loads the page with a clean agent, strips out the shit and serves a nice clean page?
Definitely beyond pihole as it stands, but doable.
It would need something that would trick the checker into reporting an all good when local extensions fiddle with the rendered page. Not impossible IMHO but I'm wayyy to dumb for that shit. I was a sre not a developer.