CONSOLE MESSAGE: line 6: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/top-url.html from loading a resource from http://127.0.0.1:8000/resources/square100.png?should_be_blocked_1
CONSOLE MESSAGE: line 7: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/top-url.html from loading a resource from http://127.0.0.1:8000/resources/square100.png?should_be_blocked_2
CONSOLE MESSAGE: line 8: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/top-url.html from loading a resource from http://127.0.0.1:8000/resources/square100.png?should_be_blocked_3
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