Examine source code of Beyond Discord

{
  "name": "Beyond Discord",
  "version": "1.1.0",
  "description": "An extension that sends dice roll results from D&D-Beyond to Discord using webhooks",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "https://discord.com/api/webhooks/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.dndbeyond.com/profile/*/characters/*"
      ],
      "js": [
        "./js/content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "./options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_popup": "./popup.html",
    "default_icon": {
      "128": "./icons/128.png",
      "512": "./icons/512.png"
    }
  },
  "icons": {
    "128": "./icons/128.png",
    "512": "./icons/512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "beyondDiscord@example.com"
    }
  }
}