Examine source code of BlueFolder

{
  "name": "BlueFolder",
  "description": "Organise your websites into folders",
  "version": "1.0.2",
  "manifest_version": 3,
  "permissions": [
    "tabs",
    "storage",
    "clipboardWrite",
    "contextMenus",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "main.html",
    "default_icon": "icons/icon-48.png"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bluefolder.bluelab@gmail.com"
    }
  }
}