User-agent sniffing for Googlebot is not recommended and is considered to be a form of cloaking. Googlebot should be treated like any other browser. If you believe your site may be affected by this update, we recommend checking your site with the Fetch and Render Tool in Search Console (which has been updated with the new user-agent string) or by changing the user-agent string in Developer Tools in your browser (for example, via Chrome Device Mode).