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The Firefox addon has never sent that information, and (though not recorded anyway) we'll be removing it from the Chrome extension and updating our privacy policy shortly.
It may not be so bad if all of a subscriber's money goes towards a single publisher. We measure rates in terms of RPM. In such a circumstance, that single publisher is receiving an excellent RPM, and that gives us a good argument for convincing new websites to join.
As you can imagine, there are many things on our to-do list -- but a list of participating sites seems to be frequently requested, so that needs to move up in priority.
Webpass.io has been designed with this in mind. Webpass.io involves removing the advertiser from the transaction -- partnering sites remove advertisements, which should eliminate tracking by advertisers. When it comes to trackers from other sources (e.g., analytics), you can continue to use plugins like Ghostery or the EasyPrivacy list.
Webpass.io is a way for you to support websites, that is compatible with whatever means you use to protect your privacy. You don't need to opt into ads/trackers/third party cookies for our service to work. We track little from our users (check our privacy policy), and we have plans for the future to make our privacy features even stronger by offering (near) anonymous use of our system.
As for our own website, we have avoided using any code that could be used to track you by third parties -- no social media buttons that talk back to their original servers, no third-party commenting system, no third-party analytics, and so on.