Examine source code of 24Kur

{
  "manifest_version": 2,
  "name": "24Kur",
  "description": "This extension will protect your sanity",
  "version": "1.2resigned1",
  "content_scripts": [
    {
      "matches": [
        "http://www.24ur.com/*",
        "http://www.moskisvet.com/*",
        "http://www.zadovoljna.si/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "icon.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{044b4e1c-7737-43b5-a1a8-bcffa16cd33c}"
    }
  }
}