How to use a proxy in Firefox

Your proxy details

After you buy a plan, open My proxies. Choose the Proxy Type (Rotating or Sticky), the Protocol (HTTP or SOCKS5) and a Format, then copy a line. The generator offers three formats:

In the examples on this page, replace USERNAME, PASSWORD, HOST and PORT with the values from your line. SOCKS5_PORT is the port the generator shows when you pick SOCKS5.

Residential lines are either rotating (a new IP on new connections) or sticky (one IP for the time you choose). Datacenter and ISP plans give you a list of dedicated IPs, one per line as IP:PORT:USERNAME:PASSWORD, and each line is one fixed IP.

To test a line, open https://ipinfo.io/json through it: it shows the exit IP and country. For HTTP lines you can also use the free proxy checker.

Set the proxy

1. 1Open Settings, type “proxy” in the search box, and click Settings… next to Network Settings. (Newer versions also list it under Privacy & Security.)
2. 2Choose Manual proxy configuration.
3. 3Enter HOST as the HTTP Proxy and PORT as its Port, then tick Also use this proxy for HTTPS.
4. 4Click OK.
5. 5Open https://ipinfo.io/json and enter USERNAME and PASSWORD when Firefox asks.

SOCKS5 in Firefox

Firefox’s SOCKS settings have no username or password fields, so use SOCKS5 there only if your IP is on the Access & API allow-list and your plan supports login by IP. Then fill in SOCKS Host and the SOCKS5 port, choose SOCKS v5 and tick Proxy DNS when using SOCKS v5. Otherwise, use an HTTP line.

Several proxies in Firefox

Each Firefox profile keeps its own proxy settings. Open about:profiles, create a profile per proxy, and launch the one you need. To make sticky lines, open the generator, set Proxy Type to Sticky, choose a Sticky Duration if your plan offers one, set how many lines you want in Sticky Amount, then copy or download them. Each line keeps its IP for the chosen time. The session part of a sticky username differs by plan, so always generate sticky lines instead of editing usernames by hand.

Choose the country

On residential plans, add -country- and a two-letter country code to the end of the username, for example USERNAME-country-us or USERNAME-country-gb. To combine a country with a state, a city or a sticky session, build the line in the generator, which shows only the options your plan supports. Datacenter and ISP IPs have a fixed location that you choose when you buy them. Type the username with the country tag in Firefox’s sign-in prompt.

Tips

• Keep localhost, 127.0.0.1 in No proxy for so local tools keep working.
• Use a sticky line for browsing sessions; rotating lines can change IP between page loads.

Troubleshooting

• “The proxy server is refusing connections”

  Firefox couldn’t reach the proxy. Check the host and port.More on this error →

• The sign-in prompt keeps coming back

  The username or password is wrong. Copy them again from the generator.More on this error →

• Wrong country

  Set the country in the generator or add -country-xx to the username on residential plans, then check https://ipinfo.io/json.More on this error →

Seeing another error? Read proxy errors and how to fix them, or contact support.

Questions