Examine source code of WindTab

{
  "manifest_version": 2,
  "name": "WindTab",
  "description": "Wind dashboard for your new tab — kitesurfing, sailing, windsurfing and more",
  "version": "1.1.1",
  "icons": {
    "16": "/icon/16.png",
    "32": "/icon/32.png",
    "48": "/icon/48.png",
    "64": "icon/64.png",
    "96": "/icon/96.png",
    "128": "/icon/128.png"
  },
  "permissions": [
    "storage",
    "alarms"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "windtab@apribit.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_action": {
    "default_title": "WindTab",
    "default_popup": "popup.html"
  }
}