Examine source code of Hide R20 Charactermancer

{
  "name": "Hide R20 Charactermancer",
  "version": "0.0.1",
  "description": "An extension to hide the Charactermancer from your players until it is time to level up",
  "homepage_url": "https://github.com/breadbored",
  "manifest_version": 3,
  "minimum_chrome_version": "100",
  "browser_specific_settings": {
    "gecko": {
      "id": "hide-charactermancer@bread.codes",
      "strict_min_version": "100.0"
    }
  },
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://app.roll20.net/editor/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://app.roll20.net/editor/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "options_ui": {
    "browser_style": true,
    "page": "options.html"
  }
}