How to Fix “This page uses security features that are incompatible with the Optimize editor”

Issue

Some people may use the Google Optimize visual editor to pop up an error: “This page uses security features that are incompatible with the Optimize editor”, as shown below:

Reason

The official explanation is:If your website uses a Content Security Policy (CSP) in HTTP headers or a <META> tag you must include the Google Optimize and Google Analytics domains in order to use Google Optimize.

Solution

But you don’t actually need to do this, you just need to refresh this page:

Look, it’s ok.