Checks if the browser is Safari.true if the browser is Safari and (if specified) within the acceptable range false otherwise. When running a web page on Safari 11, the various scripts for useragent detection methods that I have been using for a while do not detect Safari 11 on Mac 10.13.Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. The User Agent Switcher plug-in for Firefox has been a GREAT add-on and we all love it. 1 year and 27 weeks ago Ronan wrote a really simple, but useful configuration file for it that is available here on mobiForge After a great deal of research in to how to detect a users browser using php.I found out that the following code below works best so i feel like sharing.