Examine source code of Tab mess

{
  "manifest_version": 2,
  "name": "Tab mess",
  "description": "Clean up your tab mess easily",
  "version": "1.0",
  "browser_action": {
    "default_title": "Tab mess",
    "default_popup": "mess.html"
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0c1094c0-c6d8-480c-9ee6-7b1e228c0d3d}"
    }
  }
}