How to Set Up a Proxy in Mozilla Firefox
Configure Decodo’s 125M+ residential IPs directly within Firefox to isolate your browser traffic and access global content securely.
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115M+
ethically-sourced IPs
<0.6s
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success rate
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Browser-level proxy control in Firefox
Mozilla Firefox provides a dedicated network configuration that operates independently from your operating system. This allows you to integrate residential proxies in Firefox without impacting other applications on your computer, such as Spotify or Slack.
This browser-level isolation makes Firefox well suited for ad verification, proxy specific workflows, and managing multiple accounts while keeping your primary system connection unchanged.
Configuration requirements
Before you start, make sure you have the following:
- Mozilla Firefox. Download from the official website for Windows, macOS, or Linux.
- Decodo account. Sign up for a Decodo account and choose a proxy plan or a 3-day free trial.
Step-by-step Firefox proxy setup
Configure a proxy in Firefox without changing your system network settings.
Step 1. Get your proxy credentials
Start by collecting our Decodo proxy details:
- Log in to the Decodo dashboard.
- Navigate to Residential and select the Proxy setup tab.
- Choose your target location and other parameters.
- Copy the proxy server address, port, username, and password.
Step 2. Access network settings
- Open Firefox.
- Click the Menu (≡) icon in the top-right corner and select Settings.
- Scroll to the bottom of the page to the Network Settings section.
- Click the Settings… button.
Step 4. Authenticate and verify
- Restart Firefox to apply the proxy settings.
- Open a new tab and load any website.
- When prompted, enter your Decodo username and password.
- Visit ip.decodo.com to confirm that your traffic is routed through the proxy.
Troubleshooting Firefox connection issues
See how you can easily fix some of the common Firefox errors.
SOCKS5 authentication fails
Firefox has had occasional issues with SOCKS5 username and password authentication. If the login prompt doesn't appear, type about:config in the address bar, search for network.proxy.socks_remote_dns, and set it to true. If the problem continues, switch to the HTTP proxy protocol, which is generally more stable.
"The proxy server is refusing connections" error
This usually indicates an incorrect proxy host or port. Double check the details in your dashboard and make sure they were copied correctly. Also confirm that your firewall isn't blocking your selected port.
DNS leaks
Make sure Enable DNS over HTTPS is disabled in Firefox’s general settings. This ensures DNS queries are routed through the Decodo proxy and remain consistent with your assigned IP.
Why use Decodo residential proxies with Firefox
Run Decodo proxies in Firefox for isolated sessions, native SOCKS5 support, and improved privacy.
Complete browser isolation
Keep your main and routed traffic fully separated by running Decodo only inside Firefox, making multitasking easier without changing networks or system settings.
Native SOCKS5 support
Firefox handles SOCKS5 traffic natively and more reliably than most other browsers, enabling faster connections and smoother SOCKS-based workflows.
Access region-specific content
View localized websites that may be unavailable in your location by routing traffic through Decodo's network of real household devices.
Choose an affordable plan for all your Firefox browsing needs
Get unlimited concurrent sessions and comprehensive geo-targeting with our fast residential proxies.
100 GB
$1.5
/GB
Total:$450$148.5+ VAT billed monthly
Use discount code - NOIDEA67
With each residential proxy plan, you access:
115M+ ethically-sourced IPs in 195+ locations
HTTP(S) & SOCKS5 support
Continent, country, state, city, ZIP code, and ASN-level targeting
Rotating and sticky session options
<0.6s avg. response time
99.86% success rate
99.99% uptime
Seamless integration with scraping tools and bots
24/7 tech support
14-day money-back
SSL Secure Payment
Your information is protected by 256-bit SSL
Explore other browser configurations
Check out step-by-step tutorials for popular browsers and proxy management tools.
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Frequently asked questions
Can I save my proxy password so I don't have to type it every time?
Yes, you can. When the authentication prompt appears, Firefox will ask you if you want to save your login for the proxy. Click Save to store your credentials. If Firefox continues to prompt you, you can review or remove saved entries in Settings > Privacy & Security > Saved Logins.
Does Firefox support system proxy settings?
Yes, it does. Firefox uses system proxy settings by default. To use Decodo only within Firefox, go to Network Settings and switch the connection method to Manual proxy configuration.
How do I turn the proxy off?
Open Network Settings, click Settings…, and select No proxy or Use system proxy settings. Click OK. Firefox will immediately revert to a direct connection.
Secure Your Browsing Session
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