Examine source code of Text-Speech Reader

{
  "name": "Text-to-Speech Reader",
  "description": "Convert text to speech directly on your browser, making reading easier and more accessible with just one click",
  "version": "0.1.0",
  "manifest_version": 2,
  "icons": {
    "16": "./icon_one.png",
    "32": "./icon_one_big.png",
    "48": "./icon_two.png",
    "128": "./icon_two_big.png"
  },
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "options_page": "./options.html",
  "browser_action": {
    "default_popup": "/build/index.html",
    "default_icon": "icon_one.png"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{38f663d5-2083-478c-a25c-1d9f2df41d0c}"
    }
  }
}