Examine source code of check company

{
  "manifest_version": 2,
  "name": "Company URL Checker",
  "version": "5",
  "description": "An extension to check if a website belongs to a specific list of companies.",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon48.png"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "companies.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a568d54a-936a-4045-9094-503047b048c4}"
    }
  }
}