Examine source code of Text to Speech

{
  "manifest_version": 2,
  "name": "Text to Speech",
  "description": "Enable text to speech functionality",
  "version": "1.1resigned1",
  "icons": {
    "48": "icons/speak-48.png"
  },
  "background": {
    "scripts": [
      "speak.js"
    ]
  },
  "permissions": [
    "menus",
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/speak-48.png"
    },
    "default_title": "Text to Speech"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c5072f1b-b260-483b-8f21-dd9c00037a36}"
    }
  }
}