Examine source code of Move To Window

{
  "manifest_version": 2,
  "name": "Move To Window",
  "version": "0.3resigned1",
  "description": "You can move a tab to other window very easily.",
  "icons": {
    "32": "data/icon-32.png",
    "48": "data/icon-48.png"
  },
  "browser_action": {
    "default_icon": "data/icon-32.png",
    "default_title": "Move To Window",
    "default_popup": "panel.html",
    "browser_style": false
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@move-to-window"
    }
  }
}