You cannot find a VPN on Firefox addons without install an external software. If you're looking for VPN protocols (openVPN, Wireguard, IKEV2) you won't find them on Firefox or Chrome because they can't be implemented with the Chrome and Firefox APIs. So my advice to you is to stop looking and turn instead to Windows, Mac, IOS or Android applications.

If you're looking for VPN protocols (openVPN, Wireguard, IKEV2) you won't find them on Firefox or Chrome because they can't be implemented with the Chrome and Firefox APIs. So my advice to you is to stop looking and turn instead to Windows, Mac, IOS or Android applications.