Examine source code of LeadSheet Chord Reader

{
  "manifest_version": 3,
  "name": "LeadSheet Chord Reader",
  "version": "1.0.0",
  "author": "andrew@mendelsohnlabs.com",
  "description": "Clean, distraction-free reader for chord sheets. Transpose, auto-scroll, and multiple color themes.",
  "homepage_url": "https://github.com/amendelsohn/lead-sheet-chord-reader",
  "developer": {
    "name": "Andrew Mendelsohn",
    "url": "https://github.com/amendelsohn/lead-sheet-chord-reader"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://tabs.ultimate-guitar.com/tab/*",
        "*://www.e-chords.com/chords/*/*",
        "*://*.cifraclub.com/*",
        "*://*.cifraclub.com.br/*",
        "*://*.azchords.com/*",
        "*://*.ukutabs.com/*",
        "*://*.chordie.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage"
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "LeadSheet Chord Reader"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "leadsheet@leadsheet.app",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "120.0"
    }
  }
}