Examine source code of TextMuncher

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "version": "1.0.12",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "textmuncher@ebook-extractor.com",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo",
          "locationInfo",
          "websiteActivity"
        ]
      },
      "strict_min_version": "140.0"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_title": "__MSG_actionTitle__",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "contextMenus",
    "downloads",
    "*://read.amazon.com/*",
    "*://read.amazon.co.uk/*",
    "*://read.amazon.ca/*",
    "*://read.amazon.com.au/*",
    "*://read.amazon.in/*",
    "*://read.amazon.co.jp/*",
    "*://lesen.amazon.de/*",
    "*://lire.amazon.fr/*",
    "*://leer.amazon.es/*",
    "*://leggi.amazon.it/*",
    "*://ler.amazon.com.br/*",
    "*://leer.amazon.com.mx/*",
    "*://lezen.amazon.nl/*",
    "*://read.amazon.de/*",
    "*://read.amazon.fr/*",
    "*://read.amazon.es/*",
    "*://read.amazon.it/*",
    "*://read.amazon.com.br/*",
    "*://read.amazon.com.mx/*",
    "*://read.amazon.nl/*"
  ],
  "background": {
    "scripts": [
      "kindle-domains.js",
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://read.amazon.com/*",
        "*://read.amazon.co.uk/*",
        "*://read.amazon.ca/*",
        "*://read.amazon.com.au/*",
        "*://read.amazon.in/*",
        "*://read.amazon.co.jp/*",
        "*://lesen.amazon.de/*",
        "*://lire.amazon.fr/*",
        "*://leer.amazon.es/*",
        "*://leggi.amazon.it/*",
        "*://ler.amazon.com.br/*",
        "*://leer.amazon.com.mx/*",
        "*://lezen.amazon.nl/*",
        "*://read.amazon.de/*",
        "*://read.amazon.fr/*",
        "*://read.amazon.es/*",
        "*://read.amazon.it/*",
        "*://read.amazon.com.br/*",
        "*://read.amazon.com.mx/*",
        "*://read.amazon.nl/*"
      ],
      "js": [
        "kindle-domains.js",
        "reader-detector.js"
      ],
      "run_at": "document_idle"
    }
  ]
}