You need nodeJS to be installed and version 4.2 or higher is required. Please refer to the nodeJS documentation for your operating system.
This only needs to be done once on your system and can then be used on all your Drupal installations on that system. You can install it e.g. via
npm install -g browser-refresh
This also only needs to be done once on your system
npm install -g browser-refresh-client
drush browser-refresh-start
drush browser-refresh-stop
drush browser-refresh-status
drush browser-refresh-restart