Hanzo Browser Extension: AI in Every Tab

The browser is where we spend our digital lives. Hanzo Browser Extension brings AI capabilities to every website, every search, every workflow.

Core Features

Page Understanding

Select any text, right-click, and:

Summarize: Get key points from long articles
Explain: Break down complex topics
Translate: Instant translation to any language
Answer: Ask questions about the content

[Selected: 5000-word technical paper]
→ "Summarize this"
→ 5-bullet summary in seconds

Smart Search

Enhanced search results with AI summaries:

Search: "how to implement rate limiting"

Standard results: 10 blue links

With Hanzo:
📝 Summary: Rate limiting controls request frequency...
📚 Key approaches: Token bucket, sliding window, leaky bucket
🔗 Best resources: [1], [2], [3]
💬 Follow-up: "Show me a Python implementation"

Form Assistant

Intelligent form filling:

Job applications: Tailor responses to job descriptions
Support tickets: Structure bug reports clearly
Emails: Draft professional responses
Reviews: Generate thoughtful feedback

Web Automation

Record and replay web workflows:

// Recorded workflow: "Download all invoices"
1. Navigate to billing.example.com
2. Click "Invoices" tab
3. For each invoice:
   - Click download
   - Wait for completion
4. Organize in folder by date

Run with one click or schedule recurring.

Privacy Architecture

Your data stays yours:

┌─────────────────────────────────────────┐
│              Browser                     │
│  ┌─────────────────────────────────┐    │
│  │      Hanzo Extension            │    │
│  │  ┌────────┐  ┌────────┐        │    │
│  │  │ Local  │  │ Cloud  │        │    │
│  │  │ Model  │  │  API   │        │    │
│  │  └────────┘  └────────┘        │    │
│  │       ↑           ↑            │    │
│  │       └─────┬─────┘            │    │
│  │             │                  │    │
│  │    [Privacy Toggle]            │    │
│  └─────────────────────────────────┘    │
└─────────────────────────────────────────┘

Local mode: All processing on-device
Cloud mode: More powerful, data encrypted in transit
Hybrid: Sensitive content local, general content cloud

Integration Points

With Hanzo Ecosystem

Hanzo Chat: Continue conversations from browser
Hanzo Search: Enhanced search integration
Hanzo Agent: Trigger agent workflows from browser
Hanzo Storage: Save and sync findings

With Other Services

Notion: Save summaries directly
Slack: Share insights to channels
Google Docs: Insert AI-generated content
GitHub: Create issues from pages

Keyboard Shortcuts

Shortcut	Action
`Ctrl+Shift+H`	Open Hanzo sidebar
`Ctrl+Shift+S`	Summarize selection
`Ctrl+Shift+Q`	Quick question
`Ctrl+Shift+T`	Translate selection
`Ctrl+Shift+A`	Automate current page

Site-Specific Features

GitHub

PR summary generation
Code review assistance
Issue triage suggestions

Profile analysis
Message drafting
Job fit scoring

Google Docs

Writing assistance
Document summarization
Research integration

YouTube

Video summarization
Transcript search
Key moment extraction

Performance

Metric	Value
Memory usage	<50MB
Startup impact	<100ms
Query latency (local)	200-500ms
Query latency (cloud)	300-800ms

Optimized for minimal impact on browsing.

Installation

1. Chrome Web Store → Search "Hanzo AI"
2. Click "Add to Chrome"
3. Sign in with Hanzo account (optional for local mode)
4. Start using in any tab

Open Source

The extension is open source:

git clone https://github.com/hanzoai/browser-extension
cd browser-extension
pnpm install
pnpm dev  # Development mode
pnpm build  # Production build

Contribute features, report bugs, or fork for your own use.

This post is part of our retrospective series exploring the technical foundations of Hanzo.