Examine source code of Disable Tabs

{
  "author": "igorlogius",
  "homepage_url": "https://github.com/igorlogius/disable-tabs",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {},
  "manifest_version": 2,
  "name": "Disable Tabs",
  "default_area": "navbar",
  "description": "Automatically open new tabs as new seperate windows, but with a simple and quick way to make exceptions",
  "permissions": [
    "tabs"
  ],
  "version": "1.1.11",
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e85520a-4deb-43d6-a43f-d2f030ec5737}"
    }
  }
}