Examine source code of Discrub

{
  "manifest_version": 3,
  "name": "Discrub - Discord Message Manager",
  "short_name": "Discrub",
  "version": "2.0.6",
  "description": "Manage, search, and export your Discord messages with ease.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://discord.com/*",
    "*://*.discord.com/*",
    "*://*.discordapp.com/*",
    "*://*.discordapp.net/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://discord.com/*",
        "*://*.discord.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Open Discrub"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png",
    "512": "icons/icon-512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "prathercc@gmail.com"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "discrub.png",
        "bridge/*",
        "index.html",
        "assets/*",
        "*/*.zip",
        "launcher.html",
        "launcher.css",
        "launcher.js",
        "classic-wrapper.html",
        "classic-wrapper.css",
        "classic-wrapper.js",
        "classic/*"
      ],
      "matches": [
        "*://discord.com/*",
        "*://*.discord.com/*"
      ]
    }
  ]
}