Examine source code of Text 2 Speech (TTS)

{
  "manifest_version": 2,
  "name": "Text To Speech (TTS)",
  "description": "This is an addon that helps to convert text to speech",
  "version": "1.0.2resigned1",
  "homepage_url": "https://facebook.com/ogidiolu.tope",
  "applications": {
    "gecko": {
      "id": "tts@dsoft.com",
      "strict_min_version": "51.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "browser_action": {
    "default_icon": "speech-48.png",
    "default_title": "Text-2-Speech Settings",
    "default_popup": "options.html"
  },
  "icons": {
    "16": "speech-16.png",
    "32": "speech-32.png",
    "48": "speech-48.png",
    "128": "speech.png"
  }
}