A December 2025 blog post by Tarek Ziade, a Mozilla engineer who spent two years on Firefox AI features, describes how Firefox now ships multiple AI capabilities that run entirely on-device. The post reports the team built a dedicated **ML inference runtime** using **ONNX Runtime** paired with `Transformers.js`, running inside a separate content process isolated from the main browser process. According to the post, **Remote Settings** distributes both runtime and model configurations while **Ind