Examine source code of Ambient Music Player

{
  "manifest_version": 2,
  "name": "Ambient Music Player",
  "version": "1.0",
  "description": "Play soft background music while browsing.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{57a888ad-12c5-486f-be9d-4ad5c60a091d}"
    }
  }
}