So, here’s how to set up a VPN on Firefox – by installing a VPN add-on. On top of that, Surfshark is one of the most affordable VPNs out there. That’s because aside from getting plenty of servers and incredibly fast performance, you also get additional features like ad-blocking. If you want only to use a VPN add-on on Firefox, we recommend Surfshark. However, Firefox VPN add-ons are useful for accessing media streaming websites and unlocking new types of websites. If you decide to only use a VPN add-on for Firefox, know that you won’t get the same protection level as with a native VPN app.