Examine source code of Opened TTS

{
  "manifest_version": 2,
  "name": "opened-tts",
  "description": "A simple text-to-speech extension",
  "version": "0.3.2",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{09149b01-7281-48f8-8199-c0e0df7327f6}"
    }
  }
}