You should only install 1clickVPN if it appears on the official Mozilla Add-ons site with a "Recommended"
Don’t rely on the word “verified” alone. Follow these three steps before installing any VPN add-on: 1clickvpn firefox verified
Unlike paid, audited VPNs, free browser-based proxies (which many "click-and-go" VPNs actually are) may log user activity to sell to advertisers. Limited Encryption: You should only install 1clickVPN if it appears