jp343 Immersion Tracker

Browser extension that automatically tracks your Japanese immersion time on streaming platforms.

Install

• Chrome Web Store
• Firefox Add-ons

Supported Platforms

• YouTube
• Netflix
• Crunchyroll
• Amazon Prime Video
• Disney+
• Spotify
• CI Japanese

Features

• Automatic tracking on all supported platforms
• Ad exclusion across YouTube, Netflix, Prime Video, Disney+ and Crunchyroll
• Manual tracking on any website with one click
• Built-in dashboard with heatmap, streaks, session history, and monthly overview
• Channel/title blocking to exclude specific content from tracking
• Title editing during or after tracking sessions
• Optional account sync to jp343.com for cross-device stats
• Works offline with local storage, no account required

Permissions

• Storage for saving sessions and settings locally
• Tabs for the manual tracking feature (reads the active tab's title and URL when you start a session)
• Host access limited to the 6 supported platforms and jp343.com

Privacy

• All data stays in your browser unless you create an account on jp343.com
• No third-party data sharing, no analytics
• Account is optional, only needed for cross-device sync

Development

Built with WXT and TypeScript.

npm install
npm run dev          # Chrome, hot reload
npm run dev:firefox  # Firefox, hot reload
npm run build        # Production build (Chrome)
npm run build:firefox

Community

• Same-day session merge — idea by ラッキー

License

GPL-3.0. See LICENSE.