Examine source code of Zero Speed Dial

{
  "manifest_version": 2,
  "name": "Zero Speed Dial",
  "version": "1.0.0",
  "description": "A clean, customizable Speed Dial for quick access to your favorite sites from every new tab.",
  "icons": {
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "tabs",
    "webNavigation",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@zero-speed-dial.dyzrol",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}