about:config browser.ipprotection.enable

? https://support.mozilla.org/en-US/questions/1612026 Use built-in VPN in Firefox https://support.mozilla.org/en-US/kb/built-in-vpn Unable to find the built-in VPN in Firefox https://support.mozilla.org/en-US/kb/unable-find-built-vpn-firefox Otherwise, please, check, the preference, browser.ipProtection.enabled https://support.mozilla.org/en-US/questions/1578173 To complement, see also this discussion thread https://support.mozilla.org/en-US/questions/1605682 Je vis en France Utiliser le VPN intégré à Firefox https://support.mozilla.org/fr/kb/vpn-integre