Examine source code of Discord Token Swapper

{
  "name": "Discord Token Swapper",
  "description": "Safely switch between Discord accounts using tokens",
  "version": "1.1",
  "manifest_version": 2,
  "icons": {
    "48": "swapper.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "swapper.png"
  },
  "background": {
    "scripts": [
      "swapper.js"
    ],
    "persistent": true
  },
  "permissions": [
    "http://*.discord.com/*",
    "https://*.discord.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d09bd7d0-8486-4910-af15-6148b7389162}"
    }
  }
}