This is caused by a policy of the same origin and is a security mechanism that determines what data the browser is allowed to load. It helps to isolate malicious documents and thus reduce possible attack vectors. This policy prevents the browser from loading the external frameworks of LocalCDN.
If the layout of a website is incorrect or cannot be operated, then it is usually due to this policy, even though the add-on works flawlessly. Unfortunately there is no solution for this at the moment.
-Unfortunately, it sometimes happens that special characters are then displayed incorrectly. In this case you can deactivate the setting again. to display the umlauts correctly.