Firefox Smart Window adds AI form filling and webpage watching tools

Mozilla is expanding Smart Window, the AI-assisted layer built into Firefox, with two new capabilities: form filling that pulls answers from your open tabs, and a monitoring tool that watches webpages for changes such as price drops or fresh job listings. According to The Verge, both features are now rolling out to the Smart Window beta on desktop in the US and Canada, with other regions to follow "in the coming months."

Form filling from your open tabs

The form feature targets situations where the information you need is already sitting somewhere in your browser. Mozilla's example, as reported by The Verge, has Smart Window taking work history from an online portfolio or LinkedIn page open in one tab and inserting it into a job application in another.

The feature activates when you click into a form with at least four text fields. An option labelled "Fill from sources" then appears, listing every tab Firefox could draw on. You can tick or untick the tabs to include, and the browser generates suggestions from whatever the selected pages contain.

The current version only handles text fields on web forms. Mozilla says support for dropdown menus and PDFs is on the way.

Source data goes to Google's Gemini

A notable caveat sits in the fine print. Mozilla states that content from the source pages you pick is shared with Google's Gemini 3.1 Flash Lite, the model that produces the suggestions. In practice, that means text from a designated LinkedIn profile or portfolio travels to a third-party cloud service before it becomes a form entry — something to weigh before pointing the feature at sensitive documents.

Watching pages for changes

The second feature turns Smart Window into a lightweight change-detection tool. You set up a task by typing "/watch" in the Smart Window chat, describing what you are looking for, and adding the pages to track. Firefox then checks for updates on a daily or weekly basis, but only while the browser is open.

When it spots the change you asked for, Firefox notifies you through the Tasks button on the toolbar, or via a desktop notification if those are enabled. Monitoring has a shelf life: as The Verge reports, a watch is paused if nothing changes after 60 days, and stopped entirely after 90.

Why it matters

Browsers are steadily turning into AI agents with visibility across everything you do in them, and these two features show what that looks like in practice: reading one tab to fill another, and running background tasks on your behalf. For Mozilla there is a tension to manage. The convenience of cross-tab form filling rests on sending page content to Google's servers, which sits uneasily beside the privacy stance Firefox has long built its reputation on. How beta users respond to that trade-off will help determine whether assistant features like these become defaults or remain opt-in curiosities.