Yes, the way they've decided to do it, it would be easy to detect. But nothing would stop an extension from loading the initial page, loading any resources fro

Yes, the way they've decided to do it, it would be easy to detect. But nothing would stop an extension from loading the initial page, loading any resources from it, etc., without displaying it to the user. (Not that many people would want to run such an extension, since it would slow their browsing for no benefit.)