The standard way is to use Ctrl + F5 to force Firefox to download the latest version of the current page. Sometimes it doesn’t work so try the setting below.

  1. type this into the address bar: about:config
  2. In the Search bar type: browser.cache.check_doc_frequency
  3. double click on the browser.cache.check_doc_frequency line and change the value to: 1
  4. click on OK