title: ExtJS Support for Browser Detection
body: <p>I want to detect browser type so that I can log browser type in case of an error in my ExtJS application.  I know there are several JavaScript libraries that can detect browser type, but if I deploy these with my code I will have to update the libraries regularly.  </p>
  
  <p>My question is: does ExtJS do a good job keeping their browser detection functionality up-to-date?  I am using ExtJS 4.2.</p>