Setup PureBox in Mozilla Firefox
Firefox can send the DNS lookups it uses when you visit websites through PureBox instead of whatever your connection uses by default. That only applies while you are browsing in Firefox—not other apps on the same computer or phone.
When Firefox asks for a custom secure DNS address, paste this exactly (copy and paste is fine):
https://dns-us.purebox.app/dns-query
Turn on DNS over HTTPS and choose PureBox
- Open Mozilla Firefox.
- Click the ☰ menu in the top-right corner, then click Settings.
- In the left sidebar, click Privacy & Security.
- Scroll down to the DNS over HTTPS section.
- Under protection level, choose Increased Protection (keeps secure DNS on with your chosen resolver and only falls back if there is a problem) or Max Protection (stricter: Firefox warns if it cannot use secure DNS). A custom resolver URL is available with these levels; Default Protection does not let you enter your own provider.
- Open the provider menu (for example “Choose provider” or similar), then select Custom.
-
Paste
https://dns-us.purebox.app/dns-queryinto the custom resolver field. You do not need to restart the browser.
If you do not see DNS over HTTPS, your copy of Firefox may be older, or an organization may manage your browser and hide the setting. Firefox also turns secure DNS off in some cases (for example certain VPNs, parental controls, or managed-device policies). In that case, ask whoever supports your device, or set PureBox at the system or router level using the other guides here.
Test your connection
After completing the setup steps above, don't forget to test your connection and make sure it is working correctly. Click the button below to see testing instructions.