Firefox's Smart Window Can Now Fill Forms From Your Open Tabs and Watch Pages for Price Drops

Mozilla is extending Firefox's AI-powered Smart Window with two features that push the browser closer to doing actual work: form filling that reads your open tabs, and page monitoring that alerts you when a watched page changes. Both roll out now to Smart Window beta users on desktop in the US and Canada, with other countries promised "in the coming months."

The form filling works through a "Fill from sources" option that appears when you click into a form with at least four text fields. Firefox lists the tabs it plans to draw from, and you can deselect any of them before it generates suggestions. Mozilla's example: the browser pulls your work history from an online portfolio or LinkedIn page and pastes it into a job application, and can even draft answers to open-ended questions like "describe a time when..." based on those sources. For now it handles text fields only, with dropdown menus and PDF support in the works.

Privacy-conscious users should note where the data goes. Content from your selected source pages is shared with Google's Gemini 3.1 Flash Lite, the model that generates the text suggestions, meaning the processing happens in the cloud rather than on device. Mozilla stresses that Firefox's regular autofill, which populates saved names and addresses, still runs locally without any AI involved.

The second feature is invoked by typing /watch in the Smart Window chat. You describe what you are looking for — a price drop, a restock, a new job listing — and add the pages to monitor. Firefox checks daily or weekly, but only while the browser is open. Matches surface through the Tasks button on the toolbar or as desktop notifications. Under the hood, Mozilla says the change detection runs on Qwen, the open-weights model family from China's Alibaba — a notable pairing with Gemini one feature over.

The monitoring has built-in decay: a task pauses if nothing matches for 60 days and stops entirely after 90. Each task can track up to five pages, and you can keep 15 tasks running at once, according to Mozilla's documentation.

The two features land in a browser market where everyone is racing to move from answering questions to executing tasks. What is interesting in Mozilla's approach is less the capability than the plumbing: rather than betting on a single model partner, it slots Google and Alibaba models into different jobs based on cost and fit. For a nonprofit-controlled browser trying to stay relevant in the agent era, mixing commodity models may be the pragmatic play — and a sign that model choice is becoming a per-feature procurement decision, not a platform allegiance.