That's why hindi iniencourage ang BTC to Paypal exchange transaction dito sa forum.
https://bitcointalksearch.org/topic/m.197267
You only trade with trusted people in the forum, for lesser risk.
Also, you can request that funds will be send through FF, so it could not be reverse.
AFAIK kahit pa mag send ng paypal money through family and friends possible pa din yung chargeback, may mga nabasa ako na case sa ganyan kaya kung hindi highly trusted and isang user hindi pa din tinatanggap ang paypal money nya kahit pa sabihin na isesend as FF