FEO more details.js

record.metadata = {

	url: document.location.href,
	referrer: document.referrer,
	cookie: navigator.cookieEnabled ? document.cookie : 'disabled',
	language: navigator.language,
	connection: navigator.connection.effectiveType,
	hasFocus: document.hasFocus(),
	readyState: document.readyState,
	secondsIn: Math.round(performance.now() / 1000), // page age in seconds
	heap: Math.round(performance.memory.usedJSHeapSize / 1048576), // MB of heap used
	heapPercent: Math.round(performance.memory.usedJSHeapSize / performance.memory.jsHeapSizeLimit * 100), // Percent of heap used
};

...
sendError(record);