---
title: "Firefox Smart Window learns to fill web forms from open tabs and track website changes"
description: "Mozilla has expanded Firefox Smart Window: built-in AI now fills web forms using open tab data and tracks website changes via the /watch command. Features are currently in beta for the US and Canada."
date: 2026-10-28T16:22:42.741Z
lang: en
url: https://xab.info/en/posts/firefox-smart-window-ai-forms-watch
tags: [firefox, smart-window, ai, mozilla, web-browsing, automation]
author: "Alexander Buran"
publisher: "XAB.info"
---

# Firefox Smart Window learns to fill web forms from open tabs and track website changes

![Firefox Smart Window browser interface featuring an open tab and an AI prompt input bar](https://xab.info/media/2026/10/28/firefox-smart-window-ai-forms-watch/firefox-smart-window-ai-forms-watch-1.webp)

## Key Points

- Firefox Smart Window received a feature to fill web forms using open tab data
- For the "Fill from sources" option to appear, a form must contain at least four text fields
- Data from source pages is processed by the Google Gemini 3.1 Flash Lite model
- Website monitoring via the /watch command with daily or weekly checks has been added
- Monitoring pauses after 60 days of no changes and terminates entirely after 90 days
- Features are available in the desktop Firefox beta for the US and Canada

Mozilla has released an update for Firefox Smart Window, a suite of AI-powered features built directly into the browser. The new version introduces two capabilities: automatic online form filling based on data from open browser tabs, and delegating AI to track webpage content. Both features are already available in the desktop Firefox beta for users in the US and Canada, with a global rollout expected in the coming months.

### Filling forms from open tabs

The main new feature allows the browser to extract information from open tabs and insert it into web forms. A typical scenario involves a user opening their online portfolio or LinkedIn profile, then navigating to a job application page. Firefox Smart Window can pull work experience details from open sources and populate the application fields. For the "Fill from sources" option to appear, the form must contain at least four text fields, prompting the browser to display a list of tabs from which it can pull data.

### How the mechanism works and its limitations

Users retain full control over the process: they can select desired tabs or exclude unwanted ones, after which Firefox suggests completion options based on the found information. At this stage, the feature works exclusively with text fields in web forms; support for dropdown menus and PDF files is promised in upcoming updates. Technically, data from source pages is transmitted to the Google Gemini 3.1 Flash Lite model, which generates text hints to fill the fields.

### Tracking website changes

The second new capability is setting up webpage monitoring to avoid missing discounts, new job openings, and other updates. To use this, users type the "/watch" command in the Smart Window chat, describe what needs to be tracked, and specify the pages to observe. Firefox will check for updates daily or weekly—importantly, the check only runs while the browser is actively open. Upon discovering the desired changes, the browser displays a notification on the Tasks button in the toolbar or directly on the desktop if system notifications are enabled.

### Pause and termination logic for monitoring

To prevent accumulating inactive tasks, Mozilla has built-in automatic cleanup logic. If no changes are detected on tracked pages for 60 days, Firefox will pause monitoring. If no changes occur for 90 days, tracking is terminated entirely. This approach keeps the task list relevant without requiring manual management.

### Geography and availability timeline

Both new Smart Window features are currently available in the desktop Firefox beta and restricted to users in the US and Canada. Mozilla has announced the rollout of these features to other regions in the coming months. Thus, the update continues the trend of integrating AI tools directly into the browser interface, transitioning them from one-off suggestions to automated workflows for handling forms and site content.

## Fact-Check & Sources

- [Встроенный в Firefox ИИ научился заполнять формы и следить за изменениями на сайтах window-new](https://3dnews.ru/1150538/vstroenniy-v-firefox-ii-nauchilsya-zapolnyat-formi-i-sledit-za-izmeneniyami-na-saytah) - The primary source contains all key facts: form-filling mechanism, 4-field threshold, Gemini 3.1 Flash Lite model, /watch command, 60/90-day logic, and geographic availability (US, Canada).

## FAQ

### What are the requirements for a form to display the "Fill from sources" option?

The form must contain at least four text fields. Firefox Smart Window will then display the "Fill from sources" option along with a list of tabs from which data can be pulled.

### How do I set up website change tracking?

Type the "/watch" command in the Smart Window chat, describe what to track, and specify the pages. Firefox will check for updates daily or weekly, but only while the browser is running.

### When will monitoring be stopped automatically?

If no changes are detected within 60 days, Firefox pauses tracking, and after 90 days, it terminates tracking completely.

### Where are the new features currently available?

In the desktop Firefox beta for users in the US and Canada. They will roll out to other countries in the coming months.