Examine source code of Pitchi Patchi - adjust the pitch to your liking

{
  "manifest_version": 3,
  "name": "Pitchi Patchi",
  "version": "1.0.0",
  "description": "Adjust audio pitch without affecting tempo. Perfect for karaoke and music practice.",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "Pitchi Patchi - Audio Pitch Shifter"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content/injected.js",
        "content/youtube-ui.css",
        "assets/soundtouch-worklet.js",
        "assets/rubberband-processor.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "commands": {
    "pitch-up": {
      "suggested_key": {
        "default": "Alt+Shift+Up"
      },
      "description": "Increase pitch by 1 semitone"
    },
    "pitch-down": {
      "suggested_key": {
        "default": "Alt+Shift+Down"
      },
      "description": "Decrease pitch by 1 semitone"
    },
    "reset-pitch": {
      "suggested_key": {
        "default": "Alt+Shift+R"
      },
      "description": "Reset pitch to original"
    },
    "toggle-vocal-reduction": {
      "suggested_key": {
        "default": "Alt+Shift+V"
      },
      "description": "Toggle vocal reduction"
    },
    "speed-up": {
      "suggested_key": {
        "default": "Alt+Shift+Period"
      },
      "description": "Increase playback speed"
    },
    "speed-down": {
      "suggested_key": {
        "default": "Alt+Shift+Comma"
      },
      "description": "Decrease playback speed"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pitchi-patchi@karaoke.extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}