Examine source code of Merge Windows

{
  "permissions": [
    "tabs",
    "contextMenus"
  ],
  "description": "Merge multiple windows together",
  "homepage_url": "https://github.com/jonathanKingston/merge-windows",
  "manifest_version": 2,
  "name": "Merge Windows",
  "version": "1.0.3resigned1",
  "icons": {
    "96": "merge.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6d0b1446-4a7c-40e9-9bcf-568a8e26d00b}"
    }
  }
}