Examine source code of Xporcle

{
  "name": "Xporcle",
  "description": "Adds real-time multiplayer abilities to Sporcle.com",
  "version": "2.3.1",
  "manifest_version": 2,
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "show_matches": [
      "https://www.sporcle.com/*"
    ],
    "default_icon": {
      "16": "icons/icon_16.png",
      "32": "icons/icon_32.png",
      "48": "icons/icon_48.png",
      "64": "icons/icon_64.png",
      "128": "icons/icon_128.png"
    },
    "default_title": "Xporcle",
    "default_popup": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.sporcle.com/*"
      ],
      "js": [
        "xporcle.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "stylesheets/interface.css"
  ],
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "Xporcle@toransharma.com"
    }
  }
}