Firefox Smart Window beta adds tab-based form filling and page monitoring

Mozilla has expanded its Smart Window beta with two capabilities that apply on-device AI to browser workflows. The first lets users select open tabs as sources to populate web forms with at least four text fields, drawing on page content to suggest entries for work history, professional bios, and similar fields. The second adds page monitoring through a /watch command in the Smart Window chat, allowing users to track up to five pages per task for specific changes such as price drops or job postings, with checks running daily or weekly while Firefox remains open.

Both features rely on distinct AI models from the user's chat selection: form filling uses Gemini 3.1 Flash Lite for field detection and information extraction, while page monitoring employs Qwen to identify relevant changes. The features are currently limited to English-language users in the U.S. and Canada on desktop, with broader rollout planned. Mozilla emphasizes that regular autofill for saved personal data remains separate and local, and that Smart Window does not auto-submit forms.

How Smart Window's new AI features work

• Form filling architecture: The feature triggers on forms with four or more text fields, presenting a "Fill from sources" dropdown with a recommended source page; users can edit sources via a pencil icon before reviewing AI-generated suggestions.
• Model separation: Form filling sends selected tab content to Gemini 3.1 Flash Lite, while the user's chosen Smart Window chat model remains unchanged; this creates a dual-model architecture with different models handling different tasks.
• Page monitoring mechanics: The /watch command accepts natural language descriptions of desired changes, supports up to five pages per task and 15 concurrent tasks, and runs checks only while the browser is open with automatic pausing at 60 days and termination at 90 days without matches.
• Privacy boundaries: Saved autofill values (name, address) stay on-device and use Firefox's existing non-AI system; generated form fill data is not saved, and users must explicitly select which tabs share content with the AI model.
• Platform limitations: Both features are restricted to the Smart Window beta on desktop in English for U.S. and Canadian users, with no timeline for mobile or international expansion beyond "coming months."

Why it matters

Mozilla's approach of keeping traditional autofill local while routing optional AI features through explicitly user-selected tabs offers a model for how browser vendors can integrate cloud AI without collapsing all data processing into opaque pipelines. For Linux users and privacy-focused distributions, the clear separation between on-device saved data and opt-in AI processing may inform expectations for how Firefox on Flatpak or distro packages handles emerging AI features.