Examine source code of Text to Speech Voice Reader

{
  "manifest_version": 2,
  "name": "Paragraph to Speech",
  "version": "2.1",
  "description": "Selection Any Paragraph and choose Voice and Volume Speed.",
  "permissions": [
    "storage",
    "contextMenus",
    "<all_urls>",
    "declarativeNetRequestWithHostAccess"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "paragraph-to-speech@example.com"
    }
  }
}