Two possibilities. You signed up to give a monthly donation to Mozilla or you bought a yearly subscription to one of the subscription based products Mozilla has. Check your emails as there is bound to be automated emails receipts sent about the purchase or donation that tells you what it is for. The Paypal receipts should also have some information on what the payment is for also? The subscription based products are Mozilla VPN and the plus or premium versions of Firefox Relay, Pocket, MDN Plus, Mozilla Monitor. If it is about donations to Mozilla and you want to cancel then see https://foundation.mozilla.org/en/donate/help/#frequently-asked-questions https://foundation.mozilla.org/en/donate/help/ if you figure out what product subscription it is and you want to cancel, see the form links below. Mozilla VPN: https://support.mozilla.org/en-US/questions/new/firefox-private-network-vpn/form Mozilla Monitor: https://support.mozilla.org/en-US/questions/new/monitor/form Pocket: https://support.mozilla.org/en-US/questions/new/pocket/form Firefox Relay: https://support.mozilla.org/en-US/questions/new/relay/form MDN Plus: https://support.mozilla.org/en-US/questions/new/mdn-plus/form