CONSOLE MESSAGE: line 30: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/async-xhr-onerror.html from loading a resource from http://127.0.0.1:8000/contentextensions/resources/url-blocking-test.js
CONSOLE MESSAGE: line 30: Resource blocked by content blocker
CONSOLE MESSAGE: line 30: XMLHttpRequest cannot load http://127.0.0.1:8000/contentextensions/resources/url-blocking-test.js due to access control checks.
CONSOLE MESSAGE: line 30: Content blocker prevented frame displaying http://127.0.0.1:8000/contentextensions/async-xhr-onerror.html from loading a resource from http://127.0.0.1:8000/contentextensions/resources/url-blocking-test.js
CONSOLE MESSAGE: line 30: Resource blocked by content blocker
CONSOLE MESSAGE: line 30: XMLHttpRequest cannot load http://127.0.0.1:8000/contentextensions/resources/url-blocking-test.js due to access control checks.
Asynchronous onreadystatechange status: 0, readyState:1, responseText: 
Finished runTest. Waiting for callbacks
Asynchronous onreadystatechange status: 0, readyState:1, responseText: 
Finished runTest. Waiting for callbacks
Asynchronous onreadystatechange status: 0, readyState:4, responseText: 
onerror was called.
Asynchronous onreadystatechange status: 0, readyState:4, responseText: 
onerror was called.