In both Firefox and Chrome one way to trigger a hard refresh is to hold down shift and click the refresh button or press ctrl-shift-r.

 

How do I know I’m doing a hard refresh?
  • Open up Firebug (in FF) or the developer console (Chrome).
  • Go to the network tab, trigger a hard refresh.
  • If everything is showing a response code of 200, you’ve done a hard refresh.  If a resource is loaded from the cache it will show as a response 304 and you need to refresh again.