Examine source code of 600% Sound Volume (Fixed)

{
  "manifest_version": 2,
  "version": "1.0.9",
  "default_locale": "en",
  "name": "__MSG_app_name__",
  "short_name": "__MSG_app_short_name__",
  "description": "__MSG_app_description__",
  "icons": {
    "16": "icons/icon_16.png",
    "20": "icons/icon_20.png",
    "24": "icons/icon_24.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png",
    "256": "icons/icon_256.png",
    "512": "icons/icon_512.png"
  },
  "browser_action": {
    "default_title": "__MSG_app_name__",
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "icons/icon_16.png",
      "20": "icons/icon_20.png",
      "24": "icons/icon_24.png",
      "32": "icons/icon_32.png",
      "48": "icons/icon_48.png",
      "64": "icons/icon_64.png",
      "128": "icons/icon_128.png",
      "256": "icons/icon_256.png",
      "512": "icons/icon_512.png"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end",
      "js": [
        "js/scripts.js"
      ]
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "background": {
    "persistent": true,
    "scripts": [
      "js/background.js"
    ]
  },
  "web_accessible_resources": [
    "*.*"
  ],
  "permissions": [
    "<all_urls>",
    "tabs",
    "activeTab",
    "storage"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+6"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "600-sound-volume@savvamadar",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}