Various processing rules can be set for site elements. You can also set exceptions for a specific site, and different rules will apply to that site.
Setting an exception for a specific site
Removing an exception
How can I find out which elements are blocked on a page?
In many cases, icons appear in the right half of the address bar indicating that:
To find out which elements are blocked on a page:
A menu will open that lists all the permissions for this page.