Mozilla Firefox is one of the leading web browsers, known for its fast performance, strong privacy and security protections, and open-source nature. Adding a proxy to Firefox further enhances your online privacy, provides access to geo-restricted content, and secures your web activity.

There are several ways to use proxies with Firefox. One of them is through the proxy settings of Firefox itself. If you need to switch between different proxies, you can also use a proxy plugin. In this detailed guide, we’ll walk you through the process for desktop and Android users and address common issues to ensure your Firefox proxy setup works seamlessly.

How to Set Up a Proxy in Firefox

Firefox has built-in proxy configuration settings, so you can configure a proxy without changing your system’s network settings. Follow these five steps to configure your proxy.

Step 1. Open Firefox Settings

First, you need the Firefox browser installed on your device. Then launch Firefox, open the menu in the top-right corner, and click Settings.

Step 2. Open Proxy Settings

Once the Settings panel opens, go to Privacy and security in the sidebar on the left. Scroll down until you reach Connection and software security, then click Advanced settings.

Under Proxy settings, click Configure proxy.

Step 3. Select Manual Proxy Configuration

In the Connection Settings window, you’ll see several proxy configuration options. Here’s what each one does:

No Proxy: Firefox connects directly to the internet without using a proxy server.
Auto-detect proxy settings for this network: Firefox checks the current network and automatically detects available proxy settings.
Use system proxy settings: The browser follows the proxy configuration already set on your operating system. If there is no such proxy, Firefox will not use any proxy.
Manual proxy configuration: Choose this option when you want to enter the proxy server details yourself.
Automatic proxy configuration URL: Enter a PAC file URL here if your proxy settings are provided through an automatic configuration file.

To set up a proxy manually, select Manual proxy configuration. The fields underneath will become editable so you can enter your own proxy connection.

Select Manual Proxy Configuration in Firefox

Additionally, if you prefer to use system proxy settings on Windows, you can refer to our detailed guide on Windows proxy configuration.

Step 4. Enter Your Proxy Details and Save

Now you will need your proxy server details, including the protocol type, IP address or hostname, and port. If you don’t have a proxy yet, you can start with 100 MB free residential proxy trial from IPcook. The required proxy credentials can be found in the IPcook dashboard.

Check your proxy protocol, then enter the hostname and port in the corresponding fields. If you use an HTTP proxy, you can also select Also use this proxy for HTTPS to use the same proxy details for HTTPS connections.

Optionally, in the No proxy for field below, you can specify the domains or IP addresses for which you don't want to use a proxy. Do not forget to separate each domain or IP address with a comma.

Once everything is correct, click OK to save your settings.

Step 5. Authenticate the Proxy

If you use username/password authentication, Firefox will then prompt you for your proxy credentials when it first connects. Providers like IPcook let you get these details directly from the dashboard. Enter them in Firefox, then click Sign in. The proxy is now active in Firefox.

How to Use a Proxy Extension in Firefox

A proxy manager extension like FoxyProxy simplifies proxy setup and makes it easier to save and switch between different proxies without repeatedly changing Firefox settings.

Step 1. Install FoxyProxy

Add FoxyProxy Standard from the Firefox Add-ons page. Once installed, the FoxyProxy icon will appear in your Firefox toolbar.

Click the FoxyProxy icon in the Firefox toolbar, then select Options.

Step 2. Add a New Proxy

On the FoxyProxy page, open the Proxies tab, then click Add to create a new proxy profile.

Step 3. Enter Your Proxy Details

Fill in your proxy details in the corresponding fields. Give the proxy a recognizable Title, select the proxy Type, and enter the Hostname, Port, Username, and Password from your proxy provider. Here, we use an IPcook ISP proxy with the SOCKS5 protocol as an example.

Step 4. Save and Activate Your Proxy

Click Save after everything is ready. The proxy will then appear in your saved FoxyProxy profiles.

To activate the proxy, click the FoxyProxy icon in your Firefox toolbar and select the proxy profile you just created. You can now browse the web through Firefox using the proxy.

👀 Other powerful proxy manager extensions can also be used to configure proxies in Firefox, and the setup process is generally similar. If you're interested, check out our related guide:

How to Use Proxy SwitchyOmega [Step-by-Step Guide]

How to Use Proxy Switcher [Step-by-Step Guide]

How to Turn Off Proxy in Firefox

You can disable a proxy in Firefox if you no longer need to use it, either through Firefox’s proxy settings or a proxy manager extension.

Disable the Proxy in Firefox Settings

Open the Connection Settings window and select No Proxy.
Click OK to save the changes.

Disable the Proxy in FoxyProxy

Click the FoxyProxy icon in the Firefox toolbar.
Select Disable to return to your regular connection.

How to Set Up a Proxy in Firefox on Android

Firefox for Android supports browser extensions, so you can use a proxy manager like FoxyProxy to configure a proxy on your mobile device.

Step 1. Install FoxyProxy

Open Firefox on your mobile device, tap the three-dot menu, and select Extensions. Find FoxyProxy Standard, tap the + button, and select Add to install it.

Step 2. Add and Activate Your Proxy

Open FoxyProxy, go to the Proxies tab, and tap Add. Enter your proxy type, hostname, port, username, and password, then save the profile. Select the proxy profile to activate it. You can now browse safely on Firefox Android with your proxy.

Common Troubleshooting Firefox Proxy Issues

Firefox proxy issues are often related to incorrect proxy details, authentication, or connection settings. Below are some common Firefox proxy problems and the corresponding fixes.

Firefox Not Connecting to the Internet

Start by checking your proxy settings if Firefox is not connecting to the internet after configuring proxies. Make sure that Manual proxy configuration is selected and that the hostname and port match the details provided by your proxy provider.

The “The proxy server is refusing connections” message usually indicates that the proxy server is unavailable or the connection is being blocked. Verify that the proxy is active and check whether your firewall or security software is blocking Firefox or the selected port.

Proxy Authentication Fails

Repeated authentication prompts usually mean there’s an issue with the proxy Username or Password. Verify that both credentials match the details provided by your proxy provider.

If you're using IP whitelisting instead, reconfirm that your current IP address has been added to the whitelist before connecting.

Your IP Address Hasn’t Changed

If Firefox works normally but your IP address remains the same, this usually means the proxy is not active.

With Firefox’s built-in settings, confirm that Manual proxy configuration is selected. FoxyProxy users should click the extension icon and make sure the correct proxy profile is selected rather than Disable.

A Proxy Extension Is Controlling Firefox Settings

Sometimes a proxy extension takes control of the Firefox connection and prevents manual changes to the proxy settings.

You can disable the extension or manage the proxy directly through the extension before changing your Firefox proxy settings.

Conclusion

Adding a proxy to Firefox offers a simple yet powerful way to improve privacy, access geo-restricted content, and strengthen browsing security. Whether you use Firefox’s built-in proxy settings or a proxy extension, you can follow the steps in this guide to complete the setup and resolve common connection issues.

With the right combination of Firefox and a reliable proxy like IPcook, you can confidently navigate the web while maintaining your privacy and security. Start upgrading your browsing experience today!

How to Configure a Proxy in Mozilla Firefox