Examine source code of JavaScript Warning

{
  "manifest_version": 2,
  "name": "JavaScript Warning",
  "version": "1.2resigned1",
  "applications": {
    "gecko": {
      "id": "JavaScriptWarning@example.com",
      "strict_min_version": "42.0"
    }
  },
  "description": "You can store websites in a list which are not supposed to execute JavaScript code. If they try to do so the Add-on warns you.",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "warning.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ]
}