Examine source code of NS Beta Tester

{
  "name": "NitrogenSports",
  "description": "This extension allows NitrogenSports users to take part in promotions on the site and receive special bonuses.",
  "version": "0.1",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "manifest_version": 2
}