Examine source code of Page Mail: Send web page by email

{
  "manifest_version": 2,
  "name": "Page Mail: Send web page by email",
  "short_name": "Page Mail",
  "description": "Send the current page by email with title, selected text, and URL.",
  "author": "John Navas",
  "version": "1.1.1",
  "homepage_url": "https://github.com/JNavas2/Page-Mail",
  "privacy_policy": "https://jnavas2.github.io/Page-Mail/privacy.html",
  "license": "MIT",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "64": "images/icon-64.png",
    "96": "images/icon-96.png",
    "128": "images/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon-16.png",
      "32": "images/icon-32.png",
      "48": "images/icon-48.png",
      "64": "images/icon-64.png",
      "96": "images/icon-96.png",
      "128": "images/icon-128.png"
    },
    "default_title": "Page Mail"
  },
  "commands": {
    "open-page-mail-popup": {
      "suggested_key": {
        "default": "Ctrl+Alt+P"
      },
      "description": "Open Page Mail new email"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "Page-Mail-JNavas2@github.com"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}