Examine source code of 1Homepage.com

{
  "manifest_version": 2,
  "name": "1Homepage.com",
  "version": "1.1",
  "description": "Opens 1homepage.com/dashboard.php when a new tab is opened",
  "permissions": [
    "bookmarks",
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/48/icon48.svg",
    "default_title": "Add to 1Homepage",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/48/icon48.svg",
    "128": "icons/128/icon128.svg"
  },
  "chrome_url_overrides": {
    "newtab": "empty_ntp.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ef39c38b-5c2d-4e44-96bc-6649d8a7bd09}"
    }
  }
}