Examine source code of VGC OTS

{
  "manifest_version": 3,
  "name": "VGC OTS",
  "version": "1.2.6",
  "description": "Show Open Team Sheets on Pokemon Showdown",
  "permissions": [],
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://play.pokemonshowdown.com/*"
      ],
      "js": [
        "bundle.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "https://play.pokemonshowdown.com/*"
      ],
      "resources": [
        "ots-component.handlebars"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "vgc-ots@gmail.com"
    }
  }
}