Examine source code of Lofi BGM Player

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.4.5",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "alarms",
    "tabs"
  ],
  "web_accessible_resources": [
    "audio/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "lofi-bgm-player@tsubasa-ito",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Lofi BGM Player",
    "default_popup": "popup.html"
  }
}