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When I click any preview link from Stack Exchange Newsletter page, it doesn't display any preview content.

Instead of that it throwing an error.

In Mozilla FireFox I'm receiving the following error:

enter image description here

In plain text:

Blocked by Content Security Policy

An error occurred during a connection to blender.stackexchange.com.

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

In Google Chrome I'm receiving the following error:

enter image description here

In plain text:

Refused to display 'https://blender.stackexchange.com/newsletter/preview' in a frame because an ancestor violates the following Content Security Policy directive: "frame-ancestors 'self'".

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