Examine source code of Note’n’do Web Clipper

{
  "manifest_version": 2,
  "name": "Note’n’do Web Clipper",
  "version": "2.22.42",
  "default_locale": "en",
  "description": "__MSG_manifestDescription__",
  "icons": {
    "16": "icons/note-n-do/16x16.png",
    "32": "icons/note-n-do/32x32.png",
    "48": "icons/note-n-do/48x48.png",
    "128": "icons/note-n-do/128x128.png",
    "150": "icons/note-n-do/150x150.png",
    "192": "icons/note-n-do/192x192.png",
    "512": "icons/note-n-do/512x512.png"
  },
  "browser_action": {
    "default_icon": "icons/note-n-do/16x16.png",
    "default_title": ""
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/main.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "popup.html"
  ],
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "storage",
    "contextMenus",
    "scripting"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e9e863f-adeb-4cab-84e8-c12148d73b5e}"
    }
  }
}