Examine source code of Beyond The Spire

{
  "manifest_version": 3,
  "name": "Beyond The Spire",
  "description": "DnDBeyond to TaleSpire Dice roller",
  "version": "0.9.4",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.dndbeyond.com/*"
      ],
      "js": [
        "main.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{da1d921b-8e84-4326-9568-7f5e744fa918}",
      "strict_min_version": "42.0"
    }
  }
}