Examine source code of Domain Extractor

{
  "manifest_version": 2,
  "name": "Domain Extractor",
  "version": "1.0.0",
  "description": "Extracts the domain from the active tab.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "bank_domains.csv"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "applications": {
    "gecko": {
      "id": "unique-extension-id@domain.com",
      "strict_min_version": "58.0"
    }
  }
}