Examine source code of HomeBase

{
  "manifest_version": 2,
  "name": "HomeBase",
  "version": "7.2.0",
  "description": "Loads HomeBase as the new tab and homepage.",
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "newtab.html"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "https://homebase.birtik.co/*"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16dark.png",
      "32": "icons/icon32dark.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Add to New Tab",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon16dark.png",
    "32": "icons/icon32dark.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src 'self' https://homebase.birtik.co",
  "browser_specific_settings": {
    "gecko": {
      "id": "cagantshomepage@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}