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The wiki entry evidently doesn't describe what it does because according to the wiki entry it allows for the enabling and disabling of preferences. The updating of a certificate is beyond what is described in the wiki.

Mozilla should follow up with a post describing exactly how Normandy works and the full capabilities it gives them.

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From what I understand, Normandy is an infrastructure for delivery of some changes to some of Firefox users (or all of them). There are two major use cases: preferences rollout and studies. In the first case default values of preferences get changed (if your pref has non-default value, it won't affect you). In case of studies some piece of code gets delivered and executed, which cat do anything. In this hotfix the study installs add-on, which in turn installs certificate.

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