nix and nixos configs

modules/firefox.nix: add security and privacy hardening master

- HTTPS-only mode enforced - DNS over HTTPS (Cloudflare) with strict mode 3 - First-party isolation, resist fingerprinting enabled - WebRTC local IP leak prevention - OCSP stapling required, cert error bypass hidden - Referrer policy tightened - Camera/mic/location/notifications default-blocked - signon.rememberSignons and autofill disabled


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1 changed file