The Firefox built-in VPN is offered in stages to users in the U.S., U.K., Germany and France, as mentioned in the [https://www.firefox.com/firefox/149.0/releasenotes/#:~:text=built-in%20VPN Firefox 149 release notes]. It is also offered to users in Canada, starting in [[Find what version of Firefox you are using|Firefox version]] 150. It is not available to everyone, even if you are in one of these locales. If the built-in VPN is available, you would see a VPN icon in the top-right corner of the toolbar, that opens a prompt to turn on the VPN. You would also need to sign in to a Mozilla account. For more infomation, see the [[Use built-in VPN in Firefox]] article. If you wish, you can post your feedback about the Firefox built-in VPN to the [https://connect.mozilla.org/t5/discussions/introducing-firefox-s-built-in-vpn-ip-protection-now-in-the/td-p/120550 Mozilla Connect thread].

Hi That is not currently available in Firefox for Android. It may be available in the desktop copy of Firefox subject to location and whether you have been included in the beta test.