Firefox
Mozilla's open-source web browser, gaining Mistral AI features in its Smart Window tool.
Firefox, Mozilla's non-Chromium browser, is gaining French AI lab Mistral's models in a new Smart Window feature, announced 16 September 2026 days after Mistral's €3bn funding round.
Last refreshed: 22 September 2026
Timeline for Firefox
Received Mistral AI model integration in its Smart Window feature
European Tech Sovereignty: Mistral puts its models into FirefoxBackground
Firefox is Mozilla's open-source web browser, built on the Gecko engine, and one of the few major browsers not built on Google's Chromium codebase. It launched in 2004 and reported about 203 million monthly active users as of June 2026.
On 16 September 2026 Mozilla and French AI company Mistral announced a partnership bringing Mistral's models into Firefox's Smart Window feature, days after Mistral closed a €3bn Series D round.
Firefox adds a Mistral AI tool
Mozilla announced on 16 September 2026 that Firefox's new Smart Window feature will run models from French AI lab Mistral, days after Mistral closed a €3 billion Series D above a €21 billion valuation . The Series D closed on 8 September 2026, led by Samsung Electronics, with Luxembourg joining as a new investor.
Firefox runs on Mozilla's own Gecko engine rather than Google's Chromium, making it one of the few major browsers with a genuine choice of AI supplier rather than a default tied to its engine's owner.