This is the message you get when you follow the link - and the post in the editor looks like this ( attachment )
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This error message is usually triggered by an incorrectly configured website trying to display another website without the consent of the website operator.
Websites can use X-frame options or a Content Security Policy (CSP) to determine whether other websites may embed them on their own pages (for detailed information on CSP, see this MDN web docs article). This important security feature prevents clickjacking attacks, where malicious websites trick users into clicking on links from that website.
To visit a website that displays this error message, you can open the link in a new tab or a new window in Firefox. Please note that in some cases the embedded page will not work correctly without access to the blocked website. In this case, you must contact the operator of the defective website.
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