FIRO, a privacy-focused cryptocurrency formerly known as Zcoin, has seen a notable price surge over the past 24 hours. Notably, the coin is riding a wave of renewed attention fueled by a significant protocol upgrade.  According to data from CoinGecko, FIRO recorded an over 55% increase in its price in a single day. The price surge saw the coin hit a four-year high of $5.33, with its market cap rising above $100 million.