Examine source code of GX Music

{
  "manifest_version": 2,
  "name": "GX Music",
  "version": "1.0",
  "description": "GX Music makes your browser more epic",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "res/4_1.ogg",
    "res/4_2.ogg",
    "res/4_3.ogg",
    "res/4_4.ogg",
    "res/4_5.ogg"
  ],
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_title": "GX Music",
    "default_popup": "popout.html"
  },
  "icons": {
    "128": "logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5cc7c369-1a59-486c-ab2d-925f04cfd267}"
    }
  }
}