Examine source code of Tab Groups Switcher

{
  "manifest_version": 3,
  "name": "Tab Groups Switcher",
  "version": "1.1.0",
  "description": "Switch focus faster with a dedicated Firefox tab groups switcher.",
  "icons": {
    "16": "icons/icon-dark.svg",
    "32": "icons/icon-dark.svg",
    "48": "icons/icon-dark.svg",
    "96": "icons/icon-dark.svg"
  },
  "permissions": [
    "menus",
    "storage",
    "tabs",
    "tabGroups"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Tab Groups Switcher",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-dark.svg",
      "32": "icons/icon-dark.svg"
    },
    "theme_icons": [
      {
        "light": "icons/icon-light.svg",
        "dark": "icons/icon-dark.svg",
        "size": 16
      },
      {
        "light": "icons/icon-light.svg",
        "dark": "icons/icon-dark.svg",
        "size": 32
      }
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-groups-switcher@quietmindcreative.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}