Examine source code of Text Speech Reader

{
  "manifest_version": 2,
  "name": "Text Speech Reader",
  "version": "1.0",
  "description": "Convert any selected text to speech with adjustable voice, speed, and pitch controls for better web accessibility.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "reader.css"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Text to Speech Settings",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{98bee50a-bf7a-4c4d-9aca-f0585212eed3}"
    }
  }
}