A Fetch Tweets extention WordPress plugin that disables the content security policy warningss caused by widgets.js, the script provided by Twitter.com.

fetch-tweets-disable-content-security-policy-warnings.php

<?php
/*
	Plugin Name:    Fetch Tweets - Disable Content Security Policy Warning
	Plugin URI:     http://en.michaeluno.jp/admin-page-framework
	Description:    Disables the content security policy warnings caused by widgets.js, the script provided by Twitter.com.
	Author:         Michael Uno
	Author URI:     http://michaeluno.jp
	Version:        1.0.0
	Requirements:   PHP 5.2.4 or above, WordPress 3.3 or above. Admin Page Framework 3.0.6 or above
*/

class FetchTweets_DisableContentSecurityPolicyWarning {
    
    public function __construct() {
        add_action( 'wp_head', array( $this, 'replyToAddHeadTagElements' ) );
    }
        /**
         * Called when the head tag is rendered.
         */
        public function replyToAddHeadTagElements() {
            echo '<meta name="twitter:widgets:csp" content="on">';
        }
    
}
if ( ! is_admin() ) {
    new FetchTweets_DisableContentSecurityPolicyWarning;
}