Examine source code of TDRP's Cursors

{
  "manifest_version": 2,
  "name": "tdrbot.github.io Default Mouse",
  "version": "1.0",
  "description": "An extension that changes the mouse cursor to the tdrbot.github.io mouse.",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d3bf3f10-19d4-4173-b8d8-4581af51f698}"
    }
  }
}