Enabling and Configuring DNS over HTTPS (DoH) in Firefox Mobile

DNS over HTTPS (DoH) is a privacy-enhancing technology that encrypts your DNS queries, preventing your internet service provider (ISP) and potential eavesdroppers from seeing which websites you visit. This guide explains how to enable and configure DoH in Firefox for mobile devices (Android and iOS).

Why Use DNS over HTTPS in Firefox Mobile?

Using DoH offers several key benefits:

Increased Privacy: Your DNS queries are encrypted, protecting them from interception and analysis.
Improved Security: DoH helps prevent DNS spoofing and other attacks that could redirect you to malicious websites.
Faster Performance: Some DoH providers offer faster DNS resolution times compared to traditional DNS.

Enabling DoH in Firefox Mobile (Android and iOS)

The process is largely the same for both Android and iOS, though the exact location of settings may vary slightly depending on your Firefox version.

Open Firefox Mobile: Launch the Firefox mobile application on your Android or iOS device.
Access Settings: Tap the three lines (menu icon) usually located in the top right corner. Then, select "Settings" (or a similar option).
Find Privacy & Security: Look for a section labeled "Privacy & Security" or something similar. This section will contain your DNS settings.
Configure DNS Settings: You should see an option for "DNS over HTTPS" or something equivalent. Tap on it.
Choose a Provider (Optional): Firefox usually offers a default DoH provider, often Cloudflare (https://cloudflare-dns.com/dns-query). However, you can often select "Custom" to specify your preferred DoH server. This might involve inputting a custom address like https://dns.google/dns-query for Google Public DNS or another provider.
Enable DoH: Once you've chosen your provider, make sure the DoH toggle is switched to the "on" position.

Note on Custom DoH Providers

Using a custom DoH provider requires entering the correct address. Ensure you're using a reliable and trustworthy provider. Incorrectly entered addresses may prevent Firefox from working correctly.

Troubleshooting DoH in Firefox Mobile

If you encounter issues enabling or using DoH, here are some troubleshooting steps:

Check your internet connection: A poor or unstable internet connection can interfere with DoH functionality.
Update Firefox: Ensure you're using the latest version of Firefox for mobile. Older versions may lack DoH support or have bugs affecting it.
Restart your device: A simple restart can often resolve temporary software glitches that might be preventing DoH from working.
Verify DoH is enabled: Double-check that the DoH setting is actually switched on and that the provider address is correctly entered (if using a custom provider).
Check your network settings: Some network configurations might interfere with DoH. Consider temporarily disabling any VPN or proxy settings.

Warning: Network Restrictions

Some networks (schools, workplaces, etc.) may block DoH to maintain control over internet access. If you're unable to enable DoH, this may be due to such restrictions.

Popular DoH Providers

Several reputable DoH providers offer varying levels of security and privacy features. Here are a few examples:

Cloudflare: https://cloudflare-dns.com/dns-query
Google Public DNS: https://dns.google/dns-query
Quad9: https://dns.quad9.net/dns-query
CleanBrowsing: (Multiple options available – check their website)

Remember to research and choose a DoH provider that aligns with your privacy and security preferences.