Opera is praised for its exceptional speed and innovative mouse gestures, which some users find superior to those in Firefox. However, issues with the middle mouse scroll behavior have led some users to abandon Opera for Mozilla. Specific problems include difficulties using the search function on certain websites, such as physicsforums, which some users attribute to Opera's standards compliance. While some users report no issues with the search feature, others have experienced interference from ads blocking essential site elements. A suggested workaround is to block advertisements to improve functionality. Overall, while Opera has its advocates, usability concerns and compatibility with certain sites have prompted some users to switch to other browsers.