Examine source code of U4B Cashback

{
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "all_frames": false,
      "css": [
        "font-awesome.css",
        "bundle.css"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "description": "Кэшбэк от надежного сервиса U4B Cashback",
  "icons": {
    "64": "img/64.png"
  },
  "manifest_version": 2,
  "name": "U4B Cashback",
  "version": "1.1.30",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "*://*/*",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "cookies"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "64": "img/64.png"
    }
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{c90eb149-2c96-4d0e-8e39-ed0df2f163c9}"
    }
  }
}