Mozilla adds Mistral Small 4 to Firefox Smart Window as it launches in France
September 17, 2026 - 11:59 am
Credit: Mistral AI (164news.com's guide to mistral ai)
Mozilla has partnered with Mistral AI to bring the French company’s models to Smart Window, the AI browsing assistant in beta in Firefox. The two companies announced the deal on Wednesday in a joint post, alongside the feature’s launch in France.
Smart Window: An AI-Assisted Browsing Mode
Smart Window, introduced by Mozilla in August, is a separate AI-assisted browsing mode. It summarises complex searches with sources, helps users find pages they clicked away from, and draws on the tabs they have open.
Mistral’s contribution: According to Mistral’s post, Smart Window is now powered by Mistral models. However, Mozilla's announcement states that it is adding Mistral Small 4 as one option, with users still able to choose from a range of other models.
Smart Window was already available in English in the US and Canada, and France is its first new market, with official French-language support. Mistral said the UK and Germany are expected to follow later this year.
Choosing Mistral Small 4 for Multilingual Performance
Mozilla chose Mistral Small 4 partly for its multilingual performance, and Mistral is fine-tuning models on regional languages and dialects.
Privacy at the Core
Privacy is central to the pitch. Smart Window conversations are not saved on Mozilla’s servers by default, and model partners including Mistral agree to zero data retention, according to the announcement.
A Stand Against AI Gatekeepers
Mozilla CEO Anthony Enzor-DeMeo cast the deal as a stand against AI gatekeepers:
“AI is becoming part of how people experience the web every day. We want to make sure that doesn’t mean people are chained to one company’s self-serving pipeline.”
Arthur Mensch, Mistral’s co-founder and CEO, echoed this, calling it a partnership between “two open source advocates” that brings “privacy, control and choice to AI-powered web browsing.”
A Route to Consumers for Mistral
For Mistral, which mostly sells to businesses and governments, the deal is a route to consumers. It comes days after the company raised €3bn at a €21bn valuation.
Mozilla’s Careful Push into AI
For Mozilla, it’s part of a careful push into AI. Firefox users objected to earlier AI plans, and in February the company added a single setting that blocks all of the browser’s generative AI features. Smart Window stays optional, and users can control which tabs and history it can see.