I posted this reply in the other question you created:

In what way is Firefox blocking these websites? Is that a problem with a secure connection or is something else wrong?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

In Firefox 56+ the "Warn me when web sites try to redirect or reload the page" setting can no longer be found in Options/Preferences.

You can modify this pref on the about:config page to enable or disable this feature

• http://kb.mozillazine.org/accessibility.blockautorefresh

You may see a "Blocked by Content Security Policy" message when a website wants to embed content from another website in an iframe and the CSP policy prohibits this or these is otherwise a violation of the CSP rules.

• https://developer.mozilla.org/Security/CSP

I give up. You haven’t helped me solve the problem and do not have this problem with Google Chrome and do get helped much easier.

Thanks

chasim said

Blocked by Content Security Policy

This page has a content security policy that prevents it from being loaded in this way.

Firefox prevented this page from loading in this way because the page has a content security policy that disallows it.

Can you share the address? It sounds like there is an outer page that you're loading, and it has an embedded page which has rules which forbid it from being embedded or framed. You may be able to view the embedded page by right-clicking it and expanding the This Frame menu, then opening the frame in a new tab.