> In Firefox, immutable is only honored on https:// https:// transactions. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control https://deve

> In Firefox, immutable is only honored on https:// https:// transactions. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Ca... > Clients should ignore immutable for resources that are not part of a secure context https://tools.ietf.org/html/draft-mcmanus-immutable-00 https://tools.ietf.org/html/draft-mcmanus-immutable-00