Examine source code of Text-to-Speech Reader

{
  "manifest_version": 2,
  "name": "Text-to-Speech Reader",
  "version": "1.0",
  "description": "Read webpages aloud with clear voice options.",
  "permissions": [
    "activeTab",
    "tabs",
    "tts"
  ],
  "browser_action": {
    "default_title": "Text-to-Speech Reader",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b1d493c7-0698-4668-8f02-2a7034507f1d}"
    }
  }
}