Examine source code of REST API Client Tester

{
  "manifest_version" : 3 ,
  "name" : "API Client",
  "author": "onyxwizard",
  "version" : "1.0",
  "description" : "A Postman‑like API client that works on Firefox desktop & Android",
  "permissions" : [
    "tabs" 
  ],
  "host_permissions" : [
    "<all_urls>" 
  ],
  "action" : {
    "default_icon" : {
      "16" : "icons/icon-16.png",
      "32" : "icons/icon-32.png",
      "48" : "icons/icon-48.png"
    },
    "default_title" : "API Client"
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "icons" : {
    "16" : "icons/icon-16.png",
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "128" : "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "api-request-client@onyxwizard.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": []
      }
    }
  }
}