Examine source code of Email Extractor Lite

{
  "manifest_version": 2,
  "name": "Email Extractor Lite",
  "version": "2.3.8",
  "author": "Lucas Suberbielle",
  "description": "Powerful solution to automatically extract bulk emails from websites. Unlimited and free extraction service.",
  "icons": {
    "16": "icons/iconx16.png",
    "32": "icons/iconx32.png",
    "48": "icons/iconx48.png",
    "64": "icons/iconx64.png",
    "128": "icons/iconx128.png",
    "256": "icons/iconx256.png",
    "512": "icons/iconx512.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "contextMenus"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/iconx16.png",
      "32": "icons/iconx32.png",
      "48": "icons/iconx48.png",
      "64": "icons/iconx64.png",
      "128": "icons/iconx128.png",
      "256": "icons/iconx256.png",
      "512": "icons/iconx512.png"
    },
    "default_popup": "app/index.html",
    "default_title": "Email Extractor Lite"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{941bb006-5560-4a0d-b173-bb9d8c55d1a8}"
    }
  }
}