I’m not going to crawl through the notices now, but e.g. the Firefox Privacy Policy says:
To perform the purposes listed above, we work with partners, service providers, suppliers and contractors. We have contractual protections in place, so that the entities receiving personal data are contractually obligated to handle the data in accordance with Mozilla’s instructions. Learn more.
This includes Fastly (see also the Learn more link). That is the policy that applies, not Fastly’s own policy.













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It’s related to Firefox, and Firefox VPN is a Firefox feature. It does not apply to Mozilla VPN, which links to a separate policy from its home page, which indeed does mention Mullvad.
And no, you never consciously initiated a service agreement with Fastly, and so its policy doesn’t apply. The policy of the service you choose to use applies, this doesn’t have to be difficult.