Disable Content-Security-Policy (CSP) in Chromium browers for web application testing.
Install via the Chrome Web Store
Use this only as a last resort. Disabling CSP means disabling features designed to protect you from cross-site scripting. Prefer to use report-uri which instructs the browser to send CSP violations to a URI. That allows you keep CSP enabled in your browser but still know what got blocked. https://report-uri.com is a free tool that gives you a web interface to inspect CSP violations on your site.