@anthonyfordaudio I had the same issues with firefox browser too which refuses to update its css cache even after multiple hard refreshes so I had to resort to adding a little php code that automattically appends the file creation time to the end of the filename in the form style.css?4786321 so that whenever a change is made this file time number will update and the browser will detect it and reload the file
what a pain in the neck ! btw if you wish to try this the post is here