CONSOLE MESSAGE: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/subresource-redirect-blocked.html from loading a resource from http://localhost:8000/resources/square128.png
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        text run at (0,0) width 155: "This page has an image."
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        text run at (0,18) width 415: "The image load should be blocked by the content extension filter"
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