Examine source code of Showdex Champions

{
  "manifest_version": 2,
  "name": "Showdex",
  "version": "1.3.1",
  "description": "Showdex mod for Pokemon Champions format. Based on Showdex by Keith Choison (github.com/doshidak/showdex).",
  "homepage_url": "https://github.com/doshidak/showdex",
  "browser_specific_settings": {
    "gecko": {
      "id": "showdex-champions@custom-build",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "clipboardRead",
    "clipboardWrite",
    "*://play.pokemonshowdown.com/*",
    "*://*.psim.us/*",
    "*://play.radicalred.net/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://play.pokemonshowdown.com/*",
        "*://*.psim.us/*",
        "*://play.radicalred.net/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "3d-bold.svg",
    "9f2aa03b-34fc-4f68-8bf7-601b98de4c91.json",
    "9k-plus.svg",
    "a913c71f-56e3-4e6e-8f3d-2c12f7de63e9.json",
    "bug.svg",
    "buns.json",
    "catching-pokemon.svg",
    "clipboard-heart.svg",
    "close-circle.svg",
    "cog.svg",
    "content.js.map",
    "copy-plus.svg",
    "crown.svg",
    "d45db13d-567e-4b41-91d4-268cc83e1ce6.json",
    "discord.svg",
    "door-exit.svg",
    "dragon.svg",
    "error-circle-outline.svg",
    "error-circle.svg",
    "external-link.svg",
    "ff737d5b-6d95-4b08-ae74-8a2e33fc1a5d.json",
    "fire.svg",
    "flask.svg",
    "floppy.svg",
    "ghost-boo.svg",
    "ghost-off.svg",
    "ghost-smile.svg",
    "ghost.svg",
    "github-face.svg",
    "i18n.en.json",
    "i18n.fr.json",
    "info-circle.svg",
    "main.js",
    "main.js.map",
    "minarex.svg",
    "mouse.svg",
    "rabbit.svg",
    "remove-circle.svg",
    "salamance.svg",
    "showdex.svg",
    "signpost.svg",
    "sparkle.svg",
    "sword.svg",
    "team-lift.svg",
    "teddy-bear.svg",
    "tize.svg",
    "trash-close.svg",
    "winged-sword.svg"
  ],
  "icons": {
    "16": "showdex-16.png",
    "24": "showdex-24.png",
    "32": "showdex-32.png",
    "48": "showdex-48.png",
    "128": "showdex-128.png"
  }
}