Examine source code of Text to Speech Basic

{
  "manifest_version": 2,
  "name": "Text to Speech Basic",
  "version": "1.0",
  "description": "Text to Speech is a utility with the most basic and standard text-to-speech feature available today",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/text-logo.png"
    }
  },
  "icons": {
    "128": "images/text-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b474a18c-5f9b-4c70-ad97-6b16093b6354}"
    }
  }
}