Examine source code of Simple Pitch Shifter

{
  "manifest_version": 3,
  "name": "Simple Pitch Shifter",
  "version": "0.1",
  "description": "Changes the pitch and tuning of the video or music currently playing.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": "assets/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "audio/processor.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "simple-pitch-shifter-isaacteixeiratx@gmail.com"
    }
  }
}