Mozilla has added an AI feature to Firefox, and the most important detail is that almost nobody will see it unless they go looking for it.
The feature is called Smart Window. It opens as a side panel next to your normal browsing window and can answer questions using the tabs you already have open, plus information pulled from the wider internet through a search partner called Exa. It can also remember details from your browsing history, but only if you allow it to. Mozilla is rolling it out first to people in the United States and Canada who choose to turn it on.
That opt-in design is the real story here, not the feature itself. Mozilla has watched two years of AI features getting bolted onto products whether people asked for them or not, often followed by public backlash. By making Smart Window invisible until a user switches it on, and easy to turn back off, Mozilla is betting that trust with its users matters more than speed.
The timing also says a lot. The attempt to build "AI browsers" has had a rough run so far. OpenAI launched its own AI browser, ChatGPT Atlas, in October 2025 and is already shutting it down in August 2026, folding browsing back into ChatGPT itself. The Browser Company, which built a well liked AI browser called Dia, was sold to Atlassian instead of growing on its own. The one clear winner has been Perplexity, whose Comet browser went free for everyone in October 2025 and has since pulled in fresh funding at a valuation near 20 billion dollars. Opera has its own competing version, called Neon.
Mozilla arrives late to this fight, and it arrives under financial pressure that most readers will not know about. Close to three quarters of Mozilla's revenue comes from Google paying to be Firefox's default search engine. A US antitrust case against Google is asking a court to ban exactly that kind of payment to browser makers, which would blow a hole in Mozilla's budget. Adding Smart Window does not fix that problem. Mozilla pays Exa for every AI answer it delivers, and has no plan yet to charge users anything for it. Firefox's own head of product admits the company is still figuring out how, or whether, to make money from any of this.
For businesses, the practical takeaway is small for now. Smart Window is limited, opt-in, and not yet available everywhere, so there is nothing urgent to act on. The bigger pattern is worth watching: browsers are turning into a new battleground for AI assistants, the same way phones and office software already have. Within a year or two, whichever browser your team uses by default may come with an AI layer attached, whether you asked for it or not. Firefox, at least, is one of the few making that layer something you choose rather than something you inherit.