Examine source code of OLX Helper

{
  "manifest_version": 2,
  "name": "OLX Helper",
  "version": "1.1resigned1",
  "description": "OLX only",
  "content_scripts": [
    {
      "matches": [
        "*://*.olx.ro/*"
      ],
      "js": [
        "/libs/jquery.min.js",
        "/content/content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": "/icons/star-filled-19.png",
    "default_title": "OLX-er",
    "default_popup": "/popup/popup.html"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "options_ui": {
    "page": "/options/options.html"
  },
  "applications": {
    "gecko": {
      "id": "something@example.com"
    }
  }
}