RequestPolicy FTW - unlike those other plugins, it is a whitelisting system so nobody slips through just because they are new. It is also site-specific, so if you want to load up disqus from one site but not any others, you can.

https://www.requestpolicy.com/

Downside? You have to be more involved by manually whitelisting the necessary sites like CDNs. I've been using it for years and it doesn't bother me, although I'd say 5% of the time I'll just give up rather than work through a list of 10+ cross-site references.