"Blocked by Content Security Policy" – FireFox

[kaltchenko.alexeiParticipant]

I have cloned my WordPress website to a different domain/hosting using UpdraftPlus Premium (paid). It worked ok except one thing:
if using FireFox, I login to WordPress and go to Appearance > Customize (that is https://mysite.com/wp-admin/customize.php)

then I get the following message:

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.

There is no such problem with Google Chrom

[Dee NutbourneModerator]

Hi,

It is possible that this was caused by the site attempting to load content from the old location.

Please could you try clearing the cache of any caching plugin on the site?

Best Wishes,
David N

[Author]

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