Mozilla Adds Mistral Small 4 to Firefox Smart Window Beta in US, Canada and France

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Mozilla and Mistral AI announced a partnership on September 16, 2026, to integrate Mistral Small 4 into Firefox's Smart Window beta, an AI-assisted browsing feature. The rollout will initially make the model available to users in the United States and Canada, while France will see expanded beta access alongside French-language support. Mistral Small 4 will not replace existing options — users in all Smart Window beta markets can continue choosing from multiple AI models. Mozilla framed the move as part of its broader strategy to keep browser AI open and model-agnostic, rather than tied to a single provider. The announcement does not detail data handling or privacy practices for individual model providers within the beta.

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