- [today, 2026-08-19] → Mozilla blog — Firefox announces Exa now powers Smart Window on desktop and Quick Answers on iOS
When a Firefox user asks a question inside Smart Window on desktop, the answer lands with its source link shown inline, not hidden behind a “citations” button. The shift is small on the surface and large underneath: Mozilla has handed the retrieval behind that answer to Exa, a search startup built for the AI era.
Mozilla bets on partners, not a closed stack
Mozilla announced the deal today, pairing its independent browser engine with Exa’s web index rather than building a closed AI stack of its own Mozilla blog. Ajit Varma, who leads Firefox, has argued for years that the open internet is a resource people should be able to shape as new entry points like AI appear.
Varma argued, “The open internet is a critical resource and people should be able to shape it to their needs and preferences — even as new entry points like AI emerge. AI should be responsible. It should stay transparent and under your control.” The words land as a contrast to a rival model where one company owns the browser, the search engine, and the model at the same time.
Exa’s co-founder and CEO, Will Bryk, made the same point from the other side of the table. Bryk said, “Search built for the AI era doesn’t work if it’s locked inside one company’s stack. Firefox is one of the last browsers that isn’t trying to own the model, the search, and the browser all at once.” The partnership, he argued, is less about a single feature than about keeping the web’s information layer competitive.
What Exa actually does behind the answer
Under the hood, Firefox calls Exa’s /search endpoint to pull, rank, and extract passages from pages, then synthesizes a direct answer with inline citations Mozilla blog Exa blog. Exa says the answers draw on a globally sourced index spanning 1.4 trillion URLs and 100 billion documents, which lets the feature work around the world rather than from a model’s stale training data.
The privacy claim is the part Firefox most wants users to notice. Exa retains none of Firefox’s query data, according to the companies, and the browser can restrict retrieval to specific domains — routing a “how do I use this browser” question to Mozilla’s own support docs instead of a third-party blog Exa blog. That control is what Mozilla says separates a helpful assistant from a silent collector.
The privacy streak behind the deal
The move extends a privacy-leaning search streak for the browser. Firefox 154 added private Startpage search for European users, a step toward giving people defaults that don’t feed a single ad giant Firefox 154 adds private Startpage search in Europe. The Exa deal pushes the same instinct into the AI answer itself.
Mozilla has also been opening its planning to the public, publishing a Firefox roadmap alongside the 152 release Mozilla Publishes Public Firefox Roadmap Alongside Firefox 152 Release. The Exa partnership fits that open-by-default posture: a partner, not a parent.
For now the bet is that people will trust an answer they can check over one they are told to trust. If Firefox is right, the browser’s next competitive edge won’t be speed or tabs but the small, stubborn act of showing its work.
