CONSOLE WARNING: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/. CONSOLE MESSAGE: line 21: PLUGIN: NPP_SetWindow: 300 150 Verify that sync XHRs cancelled by sync NPN message does not crash. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS successfullyParsed is true TEST COMPLETE