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.
- 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.