Examine source code of Discord Thread Viewer

{
  "manifest_version": 2,
  "name": "Discord Thread Viewer",
  "version": "1.0",
  "description": "Enhances Discord with a hierarchical tree view of messages.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "https://discord.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://discord.com/*"
      ],
      "js": [
        "popup.js"
      ],
      "css": [
        "popup.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f5b0143-403d-4dbb-b4a4-cd482c955cd4}"
    }
  }
}