The deal
Mistral AI and Mozilla said on 16 September that Mistral’s models will power Firefox Smart Window, the AI browsing assistant built into Mozilla’s browser. Mistral’s announcement describes Smart Window as a tool that helps users make sense of complex searches, recall pages they have already seen and pull together information from the tabs they have open.
The rollout starts in France and North America, and Mistral says the United Kingdom and Germany should follow later in 2026. The announcement does not say which Mistral models are used, and gives no pricing.
Privacy terms
Both companies put privacy at the centre of the pitch. According to Mistral, conversations with Smart Window are not saved on Mozilla’s servers by default, and Mistral has committed to zero data retention for the service, meaning it does not keep what users send.
“A browser shouldn’t be a one-way funnel. It should preserve what made the internet powerful,” said Anthony Enzor-DeMeo, chief executive of Mozilla Corporation.
“Together, we are bringing privacy, control and choice to AI-powered web browsing,” said Arthur Mensch, co-founder and chief executive of Mistral.
Why it matters
Browsers have become a contested place for AI assistants, because they sit on top of everything a user reads and does online. For Mistral, a Paris-based model developer, Firefox puts its models in front of a broad consumer audience. For Mozilla, choosing a European supplier and leading with data retention terms fits the privacy positioning it uses to compete with larger browser makers.
What to watch
The details that matter to users are still missing: which models run the feature, whether any processing happens on the device, and what, if anything, Smart Window will cost. The expansion to the United Kingdom and Germany later this year will be the next concrete step.
