This tutorial shows how to set up HTTP proxy to work with Mozilla Firefox Browser.
5. In the HTTP proxy field enter one of NordVPN’s servers addresses. You should choose a server from NordVPN recommended servers page. Also, check the box Use this proxy server for all protocols.
7. It is optional to choose the box Do not prompt for authentication if password is saved. If you choose it, then once you save credentials for proxies, the authentication will not prompt again, unless it fails. Click on OK after you finish the setup.
That is all! Your Mozilla Firefox configuration is done.
If you want to check whether HTTP proxy really works, go to What is my IP address website. There you will see the IP address of your chosen server.