Can the Cookie Consent extension block third-party cookies?
The extension allows adding third-party cookies for further restriction. The extension blocks both Magento cookies and external scripts that run from the browser. In case the user disables the non-essential cookie groups, these cookies won’t be set.
The response from the server might be checked in the console by choosing 'Network' > 'Doc' > Open doc > Cookies > Response cookies. The cookies will be in that section before a user makes any decision, however, those cookies that aren't accepted will appear there with the value 'am_disallowed'. Before the cookies are allowed by a user, no information will be forwarded to the server.