Examine source code of Disable Red Message

{
  "manifest_version": 2,
  "name": "Disable Red Message on Immigrer.com",
  "version": "1.1resigned1",
  "description": "Disable the red message displayed on the top of the website forum.immigrer.com",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.forum.immigrer.com/*"
      ],
      "js": [
        "disable.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{63d400d7-fd1f-4987-be1e-0d7c2fe34997}"
    }
  }
}