Shares of Opera (OPRA 1.01%) rose after the web browser operator saw a huge jump in revenue and issued upbeat guidance. While the stock is down year to date, its shares are up more than 20% over the past year.For those unfamiliar with Opera, the company operates a portfolio of web and mobile browsers that are designed to optimize speed and battery life. Its browsers have been particularly popular in emerging markets, although lately it has been more focused on adding higher-valued users from developed marke ...