Firefox's Smart Window can now fill forms from your open tabs

Smart Window is Firefox's opt-in AI browsing experience. Opt-in means it stays off until you choose it. You can switch between a Classic Window and a Smart Window from a menu at the top right.

In Smart Window, you can chat with an AI assistant while you browse. 9to5Mac reports that Mozilla first announced the idea nearly a year ago under the name AI Window. It was later renamed Smart Window.

Since then it has picked up more skills. A few months ago, 9to5Mac says, Mozilla added AI-powered web search, automatic tab grouping, duplicate tab detection and the ability to search your browsing history in plain language.

Why it matters: these two features are more hands-on than a chat box. They do small chores for you, which is the direction most browsers are heading.

Think about a job application. It asks for your work history, and that history is probably sitting in another tab, on your online portfolio or professional profile. Until now, you copied and pasted it by hand.

Now Smart Window can use pages you choose to suggest what to type. Mozilla says it could draw on a profile page to fill in your work history. It could also draft an answer to a question like "Tell me about a time when..."

Here is how you use it:

• Start: Click into a form field. If the form has at least four text fields Smart Window can help fill, you see "Fill from sources" in the dropdown.
• Pick tabs: Smart Window suggests a source page. You can click the pencil icon to open "Edit sources" and change or add tabs.
• Review: Check the suggestions and edit them. Smart Window will not submit the form for you.

In real life You are applying for a job and your portfolio is open in another tab. You click into the form, choose "Fill from sources," and get a draft of your work history to tidy up instead of typing it all again.

The Verge notes that Mozilla is working on support for dropdown menus and PDF forms. For now, the feature handles text fields on web forms only.

Regular autofill is the button that types your name and address. It is not going away. Mozilla says Firefox's regular autofill still handles saved details like these, without using AI models.

Mozilla also says saved autofill values stay on your device. The new feature is for the open-ended parts of a form, the ones that no saved address can answer.

9to5Mac puts it this way: this goes beyond traditional autofill, which handles basic details like names, addresses and contact information. Smart Window writes answers based on what is on your other open pages.

This is the part worth reading twice. To fill a form, Smart Window has to read the tabs you pick. An AI model does that reading, which means the content of those pages leaves your computer.

Mozilla says the information from your selected source pages is shared with Gemini 3.1 Flash Lite. That is a Google AI model, and Mozilla says it is used for detecting the fields and extracting relevant information from your selected tabs.

Three details soften this a little:

• You choose the tabs: Only pages you select as sources are used. You can select or deselect tabs before anything is generated.
• Chat stays separate: Mozilla says your model choice for Smart Window chat stays the same. The form feature uses its own model.
• Nothing is kept: Mozilla says the feature does not save any generated form fill data.

The catch: if a tab holds something private, such as a medical page or a bank page, leave it out of your sources. The tool reads what you point it at.

The second feature is for people who refresh a page and hope. Mozilla jokes that a watched pot never boils, and that refreshing a page will not make an update appear sooner.

With "/watch," Smart Window checks pages for you. You describe what you want, such as an item going on sale or a new job listing with a job title or company name you follow. Smart Window then looks for it.

Setting it up takes four steps:

• Type: Enter "/watch" in the Smart Window chat.
• Describe: Say what change you are looking for.
• Add pages: Each task can follow up to five pages, so you can watch several stores or job boards at once.
• Choose a schedule: Firefox checks daily or weekly.

One limit matters. Mozilla says the checks run only while the browser is open. If you close Firefox for the weekend, nothing is being watched.

In real life You want a pair of boots when the price drops. You add three store pages to one task and pick daily checks. When one page shows a sale, Firefox tells you.

When there is a match, you see an update through the Tasks button in the toolbar. With desktop notifications enabled, Firefox can also notify you directly. Clicking the notification opens the watched pages.

You can have up to 15 active tasks at a time. You can edit, pause or delete any of them.

Tasks do not run forever. Smart Window automatically pauses a task after 60 days without a matching change. If 90 days pass without one, it stops checking altogether.

To spot matches, the page monitoring uses the Qwen AI model, according to Mozilla. 9to5Mac points out that this is a different model from the one used for form filling.

9to5Mac draws a comparison. It says website monitoring works similarly to Safari's new "Notify Me" feature, introduced with iOS 27 and macOS 27.

That is a fair way to see the trend. Browsers used to show pages. Now they are starting to watch them and act on your behalf, with an AI model in the middle.

Firefox's version has clear guardrails: a cap of five pages per task, a cap of 15 tasks, and automatic pausing after two months of silence.

Not everyone yet. The two features are rolling out to the Smart Window beta on Firefox for desktop. A beta is an early version that Mozilla is still testing with users.

They are available in English in the United States and Canada. Mozilla says they will roll out to additional markets in the coming months.

Mozilla invites people to try Smart Window and share their experience on Mozilla Connect, its feedback site, and to say what they would like it to help with next.

• Job hunters: Keep your portfolio or profile open and let Smart Window draft the long answers. Always read them before you submit.
• Deal watchers: Use "/watch" for sales and new listings, and keep Firefox open so the checks can run.
• Privacy minded: Pick your source tabs carefully, because their content is shared with an AI model while the feature works.
• Outside the US and Canada: You will have to wait for the wider rollout.