Examine source code of Srp Hider

{
  "manifest_version": 2,
  "name": "Srp Hider",
  "version": "1.0",
  "description": "Hides articles from Bonusweb written by Jan Srp",
  "content_scripts": [
    {
      "matches": [
        "*://www.idnes.cz/hry*"
      ],
      "js": [
        "srphider.js"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "srphider@example.com"
    }
  }
}