Examine source code of Note Sync Tool

{
  "manifest_version": 2,
  "name": "Note Sync Tool",
  "version": "1.0",
  "description": "A tool to integrate and sync notes across different applications.",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "https://www.evernote.com/",
    "https://keep.google.com/",
    "https://www.onenote.com/"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.evernote.com/*",
        "https://keep.google.com/*",
        "https://www.onenote.com/*"
      ],
      "js": [
        "popup.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/logo_64.png",
    "icons/logo_128.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f95e9db-dc82-4d7a-b568-626f3631c2f2}"
    }
  }
}