Examine source code of Auto Close New Tab

{
  "manifest_version": 2,
  "name": "Auto Close New Tab",
  "version": "1.1",
  "description": "Automatically closes the tab whenever you open a new tab.",
  "homepage_url": "https://gitlab.com/ceda_ei/autoclose-newtab",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}