Windscribe works perfectly in my Firefox browser, it's easy to use and connects quickly to its proxy servers. I test the IP location after connecting and it's always correct, it's an excellent Add-on to put your connection anywhere in the world, overall I'm very happy with it. I use it mostly to test my Google Adwords service to see how my ads appear in searches from other countries, and has been a really great utility to do this.
Kevin in Barcelona