YouTube Music lacks native synchronized lyrics display. This extension adds Karaoke-style word-by-word and line-by-line synced lyrics, making the music listening experience more engaging and accessible across languages.

1. User installs extension from Chrome Web Store 2. User opens YouTube Music and plays any song 3. Extension automatically intercepts YouTube Music API calls to extract song metadata 4. Extension fetches synchronized lyrics from multiple sources (LRCLib, Musixmatch, custom APIs) 5. Lyrics are displayed in the YouTube Music lyrics tab with time synchronization 6. User can click any line to seek to that timestamp 7. User can enable real-time translation or romanization 8. User can customize appearance with built-in themes or custom CSS via the options page

Target users: YouTube Music users who want synchronized lyrics / Music enthusiasts who enjoy Karaoke-style lyrics / Users who want lyrics in different languages with translation / Users who prefer visual customization with themes

Content script is heavily minified (170KB) making detailed logic analysis difficult
The popup and options scripts are also minified (667KB each) but keyword searches confirmed no login/payment functionality
Cannot verify actual lyrics fetching behavior at runtime, only API endpoint declarations

Monetization

No paid features detected

No payment APIs, subscription logic, premium feature gating, or upgrade prompts found anywhere in the codebase. The 'pro' keyword matches are all false positives from locale files (e.g., 'pro YouTube hudbu' = 'for YouTube music' in Czech) and CSS minification artifacts. No Stripe, billing, or purchase code exists. The extension is open-source on GitHub with all features freely available.

Confidence: 95
Payment platform: --
Source: AI / High
Login required: No
Reason: No login UI, authentication flow, or account creation code exists in the extension. The 'auth' and 'token' keyword matches are false positives from CSS styling and the bundled marked.js markdown parser library. The 'account' matches reference YouTube Music's own UI elements (ytd-account-item-renderer) in CSS themes. The extension works directly on YouTube Music's page without requiring any separate extension account.

Permission risk

Medium-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

扩展能力较强：storage

Publisher

Boidushya

Independent publisher

Email: [email protected]
Phone: --
Address: --

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Permissions

Host access