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Mozilla Firefox

Firefox uses Mozilla security libraries. Version and policy indicate possible support, while a connection supplies evidence of negotiation.

Evidence to collect

1. Record the Firefox build and managed policies.
2. Run the browser check in the Firefox profile actually used.
3. Do not infer the selected group from a padlock, TLS version, or certificate signature.

Record the scope and result

Record the tested component, client, peer, protocol, selected algorithm, and date. Keep observed negotiation, documented capability, and unknown distinct. A failed check can reflect local tooling, certificate validation, network policy, or configuration; it does not prove that all PQC is unsupported.

Official references

• Mozilla NSS documentation

Guidance reviewed 24 September 2026. Verify documentation for your deployed release; vendor capabilities and defaults change.