Examine source code of DDcashback

{
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "all_frames": false,
      "run_at": "document_start",
      "js": [
        "js/jquery.js",
        "js/content-script.js"
      ]
    }
  ],
  "name": "DDcashback",
  "short_name": "DDcashback",
  "icons": {
    "16": "icons/button.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "*"
  ],
  "description": "Global #1 Cashback Website that passes 100% money back when you shop online for free from over 5,000 brand name stores.",
  "background": {
    "scripts": [
      "js/jquery.js",
      "js/background.js"
    ],
    "persistent": false
  },
  "version": "1.0.20",
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_action": {
    "default_icon": "icons/button.png",
    "default_title": "DDcashback"
  },
  "permissions": [
    "storage",
    "tabs",
    "http://*/*",
    "https://*/*"
  ]
}