Infill

Infill is an open-source browser extension that helps you fill forms faster while keeping you in control of what gets written into the page.

What It Does

• Scans the active tab for fillable form fields.
• Matches fields against saved profile facts.
• Shows suggested mappings before filling.
• Avoids auto-filling sensitive fields unless the user approves the action.
• Stores profile state in browser extension storage.
• Supports optional encrypted profile sync through our backend after setting a passphrase.

Project Layout

.
+-- apps/extension/            # Browser extension source, UI, manifest, fixtures
+-- packages/form-brain/       # Field matching, assist, and risk logic
+-- packages/profile-vault/    # Profile facts, import, and vault state helpers
+-- packages/shared/           # Shared schemas and cross-package types
+-- docs/                      # Contributor and architecture documentation
+-- package.json               # Workspace scripts
`-- pnpm-workspace.yaml        # pnpm workspace package map

Prerequisites

• Node.js 22 or newer.
• Corepack enabled.
• pnpm 10.30.0, managed through Corepack.
• Chromium-based browser for local extension loading.

corepack enable
corepack pnpm install

Development

Run the extension build in watch mode:

corepack pnpm dev

Create a production build:

corepack pnpm build

Run tests:

corepack pnpm test

Run TypeScript checks:

corepack pnpm typecheck

The extension build output is generated under apps/extension/dist.

Load The Extension

1. Run corepack pnpm build or keep corepack pnpm dev running.
2. Open chrome://extensions.
3. Enable Developer mode.
4. Choose Load unpacked.
5. Select apps/extension/dist.
6. Pin Infill from the browser toolbar.

After source changes in watch mode, reload the extension from chrome://extensions before retesting browser behavior.

Documentation

• Architecture
• Stack
• Development Guide
• Contributing

Security

Please report security issues privately before opening a public issue. Include the affected version or commit, reproduction steps, expected impact, and whether the issue affects local Ollama, profile sync, or sign-in.