There is in fact already an extension which will randomly change the browser user agent.<p><a href="https:&#x2F;&#x2F;github.com&#x2F;dillbyrne&#x2F;random-agent-spoofer" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;dillbyrne&#x2F;random-agent-spoofer</a>