Examine source code of Page Note Selection

{
  "description": "A plugin for taking notes from web pages with a lot of features!",
  "manifest_version": 2,
  "name": "Page Note Selection",
  "version": "0.4",
  "icons": {
    "32": "icons/toolbar-32.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery-3.4.1.min.js",
        "Note.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage",
    "notifications",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/toolbar-32.png",
    "browser_style": true,
    "default_popup": "popup/popup.html"
  }
}