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FWIW, you do not need to go the Chrome extension website to install an extension. It can be hosted by a 3rd party via a simple link on any website.

Yes, I get your point, but if you take an example of CNN, they are not going to have a link to disable FB Connect.

Right. But they aren't going to have an explanation on how to block FB connect with your firewall, so it's not really a disadvantage of an extension.