Opera (OPRA) shares surged more than 15% after the opening bell following the companys announcement that it is expanding support for Tethers USDT stablecoin and Tether Gold (XAUT) in its self-custodial crypto wallet, MiniPay. The news sparked renewed investor interest after OPRA stock had slid to a recent low of $12.40 earlier in the week, before rebounding sharply to around $14.65.