CONSOLE MESSAGE: Refused to load http://localhost/foo.png because it does not appear in the img-src directive of the Content Security Policy.
CONSOLE MESSAGE: line 33: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/block-csp-report.php from loading a resource from http://localhost:8000/contentextensions/resources/save-ping.php?test=contentextensions-block-csp-report
This test creates a CSP violation report, but the report URL matches a 'block' rule.  

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Frame: 'result_frame'
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Ping not received - timed out.