UPDATE: Firefox doesn't provide the API required to implement DNS Flusher's features on the newer versions of Firefox, thus unfortunately there's no plan update DNS Flusher to work on such versions.
Should this scenario change, we'll update our beloved extension and make it great again.
Until then, thank you so much for all the support, donations and great 10 years of success.
DNS Flusher team of one!
DNS Flusher is a extension for reload changes made on hosts file. When you change your hosts file, the browser does not load the changes, you need restart it for the changes takes effect. With this extension, you only need to click on the IP showed in the status bar and the DNS will be flushed.
Learn more about it here: http://www.coders.com.br/dns-flusher