Continuum Browser

A task-first, privacy-native browser that preserves context and lets you resume exactly where you left off.

Version 2.0.0 · Created by Mahesh Rao

Platforms: macOS · Windows

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✨ Philosophy

Resume your work, not your tabs.

Continuum organizes browsing into Workspaces — persistent contexts that remember everything: your scroll position, open pages, notes, and focus. Unlike Chrome where tabs disappear and history is lost, Continuum treats your browsing as continuous work.

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🚀 Features

🔄 Workspace Resume

When you return to any page, you're exactly where you left off.

• Cascading Restore Strategy:
  1. DOM Anchor — Find the text you were reading
  2. Scroll Ratio — Restore proportional position (handles layout shifts)
  3. Pixel Position — Fallback to exact Y coordinate
• Redirect Detection — Handles URL redirects gracefully
• Toast Feedback — "Restored exactly where you left off" with method shown
• Per-Page State — Scroll, zoom, and form data persisted

📝 Notes Panel

Keep notes per Workspace — markdown-friendly scratchpad.

• Renameable Title — Click to customize (e.g., "Research Notes", "To-Do")
• Collapsible — State persisted per Workspace (localStorage)
• Auto-Save — Debounced 800ms save
• Word & Character Count — Shown in footer
• Empty State Hint — "Use this space to capture thoughts..."
• Markdown Support — Plain text with markdown hint

✂️ Send to Notes

Clip content from any webpage directly into notes.

• Right-Click Context Menu — Select text → Right-click → "Send to Notes"
• Markdown Quote Format:

  > Selected text here...
  
  — hostname.com

• Instant Append — No modal, no delay
• Copy + Select All — Standard context menu items included

⚡ Quick Switcher (Cmd+K)

Power-user fast switching between Workspaces.

• Keyboard Shortcut — Cmd+K (Mac) or Ctrl+K (Windows)
• Instant Open — BrowserView paused for <16ms response time
• Debounced Search — 150ms input debounce
• Keyboard Navigation — ↑ ↓ to navigate, Enter to switch, Esc to close
• Smart Sorting — Active Workspace first, then by most recently updated
• Resume Indicator — Shows which Workspaces have pages to resume

🔍 Multi-Engine Search

6 search engines with persisted preference.

Engine	Prefix
Google	default
Bing	—
DuckDuckGo	—
Yahoo	—
Ecosia	—
Naver	—

• Dropdown Selector — In address bar
• Persisted Preference — Saved to localStorage
• URL Detection — Auto-detects URLs vs search queries
• Naver Integration — Auto-default for Korean locale

📥 Download Manager

Minimal, workspace-aware download tracking.

• Unobtrusive UI — Icon only appears during active downloads
• Workspace Aware — Tracks downloads across all isolated sessions
• System Integration — Native notifications on completion
• Quick Actions — Pause, Resume, Reveal in Finder

🤖 AI Agent (Second Brain)

Ask questions or delegate tasks to your AI agent.

• Dual Modes:
  • Chat Mode — Summarize, explain, and question (Read-only)
  • Agent Mode — Fill forms, navigate, and click buttons (Active)
• Security First — Granular permissions, Power Levels (1-3), and human approval for all actions
• Multi-Provider — Works with OpenAI, Gemini, Claude, or GitHub Models
• BYOK — Bring Your Own Key for privacy
• Visual Detection — Vision-based fallback for element interaction
• CDP Bridge — Chrome DevTools Protocol for trusted, CSP-safe browser automation

🛡️ Continuum Shield

Network-level protection with built-in ad and tracker blocking.

• 164,000+ Filter Rules — Comprehensive blocklist
• 3 Blocking Levels — Standard, Aggressive, Maximum
• YouTube Ad Blocker — Skip and hide video ads, banner ads, and premium upsells
• Popup Blocker — Blocks malicious popups and cross-origin redirects
• Cosmetic Filtering — Removes ad elements from page DOM
• Mutation Observer — Catches dynamically injected ads in real-time

🔒 Privacy Focus

Native privacy controls and site management.

• Per-Site Permissions — Toggle Location, Camera, Mic per site
• Anti-Fingerprinting — Active fingerprint protection in renderer
• Privacy Overview — See blocking stats in Settings
• Lock Icon — Quick access to site security settings
• Cookie Blocking — Third-party cookie control
• No Telemetry — Nothing leaves your machine

🔄 P2P Sync (beta)

Securely sync your data across devices without a central server.

• End-to-End Encryption — Data stays encrypted during transit
• Peer-to-Peer — Direct WebRTC connection between your devices
• Generate or Join — Create a sync key or join an existing session
• Status Indicator — Real-time connection and peer count display
• No Cloud Required — All sync happens locally between devices

🔐 WebAuthn / Touch ID

Native biometric authentication support.

• Touch ID on Mac — Hardware-backed authentication
• Passkey Support — WebAuthn FIDO2 compliant

📚 Bookmarks & History

Quick access to saved pages.

• Star Button — One-click bookmark in address bar
• History Panel — Toggle with clock icon
• Tabbed Interface — Switch between History and Bookmarks
• Click to Navigate — Opens page in current Workspace

🪟 Native Window Experience

macOS-native feel with custom title bar.

• Hidden Title Bar — hiddenInset style with traffic lights
• Draggable Regions — Sidebar header and address bar
• Full-Width Browsing — Notes panel hides when viewing a page
• Theme Support — Multiple themes including Midnight, Glass, and more

🌐 Global Language Support

Full internationalization with 19 supported languages.

• Smart Language Dropdown:
  • Suggested — Auto-detected from system language
  • Popular — Collapsible common languages list
  • All Languages — Searchable full list
• Supported Languages:
  • Indian: Hindi, Tamil, Telugu, Kannada, Malayalam, Marathi, Bengali, Gujarati, Punjabi
  • Global: English, Spanish, French, German, Portuguese, Russian, Chinese, Japanese, Korean, Arabic
• Context-Aware — Language preference persisted locally
• Native Naming — "日本語 (Japanese)", "हिन्दी (Hindi)" for better readability

🎬 DRM Content Support

Watch protected content with built-in Widevine CDM.

• CastLabs Electron — Custom Electron build with Widevine DRM support
• EVS VMP Signing — Verified Media Path for content providers
• Netflix, Spotify, Disney+ — Protected streaming content works out of the box

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⚡ Performance Optimizations

Optimization	Description
BrowserView Pause	Hidden during overlays for <16ms response
Spellcheck Disabled	Reduces CPU during video playback
DevTools Disabled	Only enabled in development
No Backdrop Blur	Solid backgrounds instead of GPU-heavy blur
Debounced Inputs	Search and notes save are debounced
Memoized Components	FlowSwitcher and FlowRow use memo()

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🎯 Key Differentiators

Chrome	Continuum
Tabs disappear on close	Pages persist forever
Start fresh every time	Resume exactly where you stopped
One shared session	Isolated sessions per Workspace
Tab chaos	Organized Workspaces
Scroll position lost	Cascading scroll restore
Copy-paste to notes	Right-click "Send to Notes"
One search engine	6 search engines to choose from
No built-in ad blocking	164K+ filter rules + cosmetic filtering
No DRM on some builds	Widevine DRM built-in

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🛠 Development

Prerequisites

• Node.js 18+
• npm
• Python 3 (for CastLabs EVS signing on macOS)

Setup

# Install dependencies
npm install

# Run in development 
npm run dev

# Build for macOS (universal)
npm run build:mac

# Build for Windows
npm run build:win

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📦 Tech Stack

Component	Technology
Framework	CastLabs Electron (Chromium + Widevine)
UI	React 18 + TypeScript
Styling	Tailwind CSS
State	Zustand
Build	Vite + electron-builder
Icons	Lucide React
AI	Multi-provider (OpenAI, Gemini, Claude, GitHub)
Automation	Chrome DevTools Protocol (CDP)
Ad Blocking	Custom filter engine (164K+ rules)

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📄 License

This project is licensed under the MIT License — see the LICENSE file for details.

MIT © 2026 Mahesh Rao