Examine source code of Send Link

{
  "manifest_version": 2,
  "name": "Send Link",
  "description": "Send links via customizable context menu entries as GET requests (mailto: is also supported).",
  "version": "1.1.0",
  "author": "Bernd Bestel",
  "homepage_url": "https://github.com/berrnd/send-link",
  "applications": {
    "gecko": {
      "id": "{136e3622-5051-49cf-b866-9750f49aa835}"
    }
  },
  "permissions": [
    "contextMenus",
    "storage",
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}