Examine source code of Notejoy Web Clipper

{
  "name": "Notejoy Web Clipper",
  "version": "1.2.0",
  "manifest_version": 2,
  "description": "Save and share anything you see on the web directly to Notejoy.",
  "homepage_url": "https://notejoy.com",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "iframe.html",
    "iframe.js"
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    },
    "default_title": "Clip to Notejoy"
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ]
}