After upgrading my Confluence Data Center instance to 7.4.14, I am getting CORS errors on the "Manage apps" screen when expanding some of the plugins on my instance. You can see the issue here:
https://www.screencast.com/t/fXA565cj
As you can see, it looks like a request is getting blocked from the following URL:
https://marketplace.atlassian.com/rest/2/addons/com.adaptavist.confluence.contentFormattingMacros/pricing/server/live?countryCode=FI
I have already tried adding a whitelist for the marketplace.atlassian.com domain, which you can see here:

I have also added the following the following modification to the web.xml file (as suggested here):
<!-- MBZ: Added CORS Headers -->
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>org.apache.catalina.filters.CorsFilter</filter-class>;
<init-param>
<param-name>cors.allowed.origins</param-name>
<param-value>https://www.atlassian.com,https://marketplace.atlassian.com,https://support.member.buzz,https://www.member.buzz,https://resources.member.buzz,https://files.member.buzz</param-value>
</init-param>
<init-param>
<param-name>cors.allowed.methods</param-name>
<param-value>GET,POST,PUT,DELETE</param-value>
</init-param>
<init-param>
<param-name>cors.exposed.headers</param-name>
<param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
</init-param>
<init-param>
<param-name>cors.support.credentials</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>cors.preflight.maxage</param-name>
<param-value>1800</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>