https://support.mozilla.org/en-US/kb/built-in-vpn https://blog.mozilla.org/en/firefox/built-in-vpn/ https://blog.mozilla.org/en/firefox/firefox-148-149-new-features/ This "VPN in Firefox" feature is experimental and is being introduced to the Firefox user base through a progressive rollout starting in Fx 149.0. It may not yet be available to all users. <blockquote>Users will have '''50 gigabytes of data monthly''' in the U.S., France, Germany and U.K. to start. Available in Firefox 149 starting March 24.</blockquote> I have not heard of any plans to have a subscription based version of this new built-in VPN feature to have a larger or unlimited data limit each month, especially since Mozilla has their standalone "Mozilla VPN" subscription based app.

Ok I got a reply that uncapped data plans isn’t something Mozilla is planning right now, but they are definitely taking feedback into account and may explore it down the line.