We don't have a way to pause subscriptions, but you can cancel your subscription and resubscribe again at any time. All your remaining extensions will still be there when you come back.
If your account is on one of our legacy plans (i.e. one that is not currently shown on our pricing page), you won't be able to get that plan anymore. Once your subscription is canceled, you'd only be able to subscribe to the new rate when you come back. You would need to go to your miniExtensions dashboard to start a new subscription with the plans currently available.