Examine source code of Refundo Toolbar

{
  "manifest_version": 2,
  "author": "Refundo s.r.o.",
  "name": "Refundo Toolbar",
  "short_name": "Refundo",
  "version": "2.2.5",
  "default_locale": "cs",
  "description": "__MSG_appDesc__",
  "icons": {
    "16": "images/icon_16.png",
    "48": "images/icon_48.png",
    "128": "images/icon_128.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "webRequest",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/icon_16.png",
      "48": "images/icon_48.png",
      "128": "images/icon_128.png"
    },
    "default_title": "Refundo Toolbar"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "images/*",
    "infobar/*",
    "js/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "infobar/script.js"
      ],
      "css": [
        "infobar/style.css"
      ]
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "toolbar@refundo.cz"
    }
  }
}