Examine source code of UI-command

{
  "manifest_version": 2,
  "name": "UI-command bE",
  "version": "2.19",
  "description": "kdc SEO",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "32": "img/icona.png"
  },
  "browser_action": {
    "default_icon": {
      "32": "img/icona.png"
    }
  },
  "background": {
    "scripts": [
      "openuic.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "openuic.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0abd773-c851-47f5-897c-3a2aec4be020}"
    }
  }
}