Examine source code of noteKaar

{
  "manifest_version": 2,
  "name": "noteKaar",
  "version": "1.0",
  "description": "Press C + N to create a sticky note or Right click in any websites",
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "commands": {
    "create_note": {
      "description": "Create a new sticky note"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7239d92d-ce1e-4357-baf6-22504df89099}"
    }
  }
}