Firefox’s Smart Window can now fill out online forms using information from your open tabs, and watch web pages for the exact changes you ask about, Mozilla announced on October 27, 2026. The two new features are rolling out to the Smart Window beta on desktop, in English, in the United States and Canada, with more markets to follow in the coming months. Smart Window is Firefox’s opt-in AI browsing experience, designed to let users interact with an AI assistant inside the browser without leaving the page they are on.
Let Your Open Tabs Fill In The Blanks
Job applications ask for your work history. Event registrations ask for a professional bio. If those details are already in your open tabs, Smart Window can now use the pages you choose to suggest what to enter, saving extra clicks and copy-and-paste. For example, it could use information from an online portfolio or professional profile to fill in work history, or draw on those details to draft an answer to a question like “Tell me about a time when…”
To get started, click into a form field. If the form has at least four text fields that Smart Window can help fill, you will see “Fill from sources” appear in the dropdown, along with a recommended source page. Select that option to continue, or click the pencil icon to open “Edit sources” if you want to change or add tabs. Once you have chosen your sources, review the suggestions before filling out the form. You can edit the results before submitting, and Smart Window will not submit the form for you.
That keeps a human in the loop: conventional autofill handles saved names and addresses without AI, while Smart Window generates responses from pages you selected, so its suggestions need checking before submit.
The Privacy Trade-Off, Stated Plainly
Mozilla is unusually direct about what happens to your data when you use the feature. When you choose to use form filling, information from your selected source pages is shared with Gemini 3.1 Flash Lite, the AI model used for detecting the fields and extracting relevant information from your selected tabs. Your model choice for Smart Window chat stays the same, and saved autofill values stay on your device, Mozilla says, but the source-page data itself does leave the device for processing.
That trade-off is the real story: the convenience comes from letting a model read pages you already have open. Users sharing a public portfolio will see little downside, but anyone with sensitive tabs open alongside a form should use the source picker carefully and deselect anything they do not want the model to see.
The feature currently supports text fields only and does not save generated form data. Mozilla is exploring dropdown menus, PDF forms and ways to save generated information, but until those arrive, applications depending on them still need finishing by hand.
Give Your Refresh Button A Break
The second feature is simpler, and for many users more immediately useful. Smart Window can now watch a page for a specific update, whether that is an item going on sale or a new job listing that includes a job title or company name you are following. Each task can follow up to five pages, so you can keep an eye on several stores or job boards at the same time.
Type “/watch” in Smart Window chat to set up a task, describe what you are looking for, add the pages, and choose daily or weekly checks. Those checks run only while the browser is open, not overnight while your computer is off. Matches appear through the Tasks button, or as desktop notifications if enabled.
You can have up to 15 active tasks, which you can edit, pause or delete. Tasks pause after 60 days without a match and stop after 90 days. Page monitoring uses the Qwen model, while form filling uses Gemini, so the two features send different data to different models.
Why It Matters
This matters because browsers are becoming the next front in AI assistance, and Firefox is taking a different path from its rivals. Google’s Chrome is adding AI features tied to its own models and services, as in our report on Chrome’s vertical tabs, and Opera is pushing AI that runs locally in the browser, as in our report on Opera’s WebAI for local AI models. Mozilla’s approach is more modest and more transparent: an opt-in beta, a clear statement about which model sees your data, and a human review step before anything is submitted.
That modesty is also its limit: Smart Window is still a beta, limited to desktop, English, two countries, text fields and browser-open checks. For US and Canadian users who fill out many forms or watch many pages, it is useful today; for everyone else, it is a sign of where Firefox is heading. The test will be whether Mozilla expands it without losing the transparency that makes it different.
Background
Smart Window was previously called AI Window, an opt-in browsing experience Mozilla first outlined nearly a year ago. It already offers AI-powered web search, automatic tab grouping, duplicate-tab detection and natural-language search across browsing history.
Source: Mozilla blog post
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