Examine source code of Basic Text-to-Speech

{
  "manifest_version" : 3 ,
  "name" : "Basic Text-to-Speech",
  "version" : "0.1.0",
  "description" : "Reads articles aloud with a natural voice that runs on your own computer, highlighting each sentence as it goes.",
  "icons" : {
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "96" : "icons/icon-96.png",
    "128" : "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "basic-text-to-speech@razmikb",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions" : [
    "activeTab" ,
    "menus" ,
    "scripting" ,
    "storage" 
  ],
  "content_security_policy" : {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
  },
  "background" : {
    "page": "background.html"
  },
  "action" : {
    "default_title" : "Read this article aloud",
    "default_icon" : "icons/icon.svg"
  },
  "options_ui" : {
    "page": "settings/settings.html" ,
    "open_in_tab": true
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "content.js" 
      ],
      "run_at" : "document_idle" 
    }
  ],
  "web_accessible_resources" : [
    {
      "resources" : [
        "lib/*.js" ,
        "lib/engines/*.js" 
      ],
      "matches" : [
        "<all_urls>" 
      ]
    }
  ]
}