Firefox gets a Mistral-powered browser assistant
The beta starts in France and North America, summarizes open tabs, and by default keeps no conversation history on Mozilla's servers.
In short
Mozilla's new Firefox Smart Window assistant is powered by Mistral's models and opens as a beta in France and North America.
At a glance
- Firefox Smart Window is out in beta and runs on models from the French provider Mistral.
- The assistant handles complex searches, recalls pages you visited, and summarizes what is in your open tabs.
- Per the announcements, Mozilla does not keep conversations by default, and Mistral pledges to retain no data.
- It launches in France and North America; the UK and Germany are slated to follow later in 2026.
- Neither report names which specific Mistral models sit behind the assistant.
Mozilla's next significant Firefox feature has a French engine under the hood. Firefox Smart Window, now in beta, is built on Mistral's models, and it is starting in France and North America before the UK and Germany get it later in 2026.
What the assistant actually does
Smart Window is pitched as browser plumbing rather than a chatbot bolted onto the side. It is meant to carry multi-step searches, surface pages you have already looked at, and condense whatever is sitting in your open tabs.
That is a fair read of where browsing actually hurts: a row of tabs nobody can account for anymore. How well it holds up outside a beta running in two markets is not something the announcements settle.
Privacy is the pitch
Both companies lead with data handling. By default, conversations with the assistant are not supposed to persist on Mozilla's servers, and Mistral says it keeps no data of its own. Treat that as a commitment rather than a verified property, because neither report points to an audit or technical documentation behind it.
Why Mistral wants a browser
Mistral has sold mostly to businesses. Firefox hands it a consumer surface it would otherwise have to build and market alone. Both sides frame the browser as a marketplace that should stay open to competing AI providers, with open-source pieces in the mix, which reads as the default slot rather than the only one.
What is still unknown
The model lineup behind Smart Window is undisclosed. Also missing: a firm German launch date beyond the year, any pricing detail, and whether users will eventually be able to swap in a different provider.
FAQ
What is Firefox Smart Window?
It is an AI assistant built into the Firefox browser that helps with complex searches, brings back pages you visited, and summarizes your open tabs. It is in beta and runs on Mistral's models.
Where can I use Smart Window right now?
The beta is available in France and North America. The UK and Germany are expected later in 2026, without a specific date announced so far.
Does Smart Window store my chats?
According to both companies, conversations do not stay on Mozilla's servers by default, and Mistral says it retains no data. Those are stated commitments; no independent verification has been published.
