Examine source code of Tab Wheel (Ctrl+E)

{
  "manifest_version": 3,
  "name": "Tab Wheel (Ctrl+E)",
  "version": "1.3",
  "description": "Hold Ctrl+E to pick a tab in a radial wheel",
  "permissions": [
    "tabs",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "show-tab-wheel": {
      "suggested_key": {
        "default": "Ctrl+E"
      },
      "description": "Open the tab wheel"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-wheel.milanspiridonov@abv.bg"
    }
  }
}