CONSOLE MESSAGE: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/basic-filter.html from loading a resource from http://localhost:8000/resources/square100.png
CONSOLE MESSAGE: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/basic-filter.html from loading a resource from http://127.0.0.1:8000/resources/square100.png?localhost_not_at_end
CONSOLE MESSAGE: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/basic-filter.html from loading a resource from http://127.0.0.1:8000/resources/square100.png?ends_with_localhost
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