Examine source code of No Tabs

{
  "manifest_version": 2,
  "name": "No Tabs",
  "version": "1.3resigned1",
  "description": "Opens all new tabs in a new window instead",
  "homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/beastify",
  "icons": {
    "32": "icons/32.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/32.png",
    "default_title": "No Tabs"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{372b19dc-789b-45ee-a817-90c405a7d37e}"
    }
  }
}