Open Firefox on a computer
Click on the ☰ icon > Options (or Preferences on a Mac)
Click the General tab
Scroll down to the Network Proxy section and click Settings
Check the Manual proxy configuration box
Type your address (e.g.: gw.proxy.rainproxy.io) and port (e.g.: 5959) under HTTP, and enter your User:Pass (e.g.: user-cc-us:password) proxy credentials.
Check the Use this proxy for all protocols checkbox
Click OK
Check the IP https://ipinfo.io/
Setup Proxy on Firefox
Configure FireFox with Rainproxy
Written by Jennifer C.