Examine source code of Link prechecker

{
  "name": "Empfohlene CLMS Unterstützung",
  "version": "1.0",
  "description": "empfohlene Softwareunterstützung um CLMS zu unterstützen",
  "background": {
    "page": "bg.html"
  },
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "tabs"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{54429495-0b40-4c64-a0cd-bff5db415e41}"
    }
  }
}