Automating browser testing with Selenium Opera in Python is an effective method for ensuring web applications function smoothly across different browsers, including Opera, which holds a notable market share due to its performance on slow internet. While manual cross-browser testing is feasible, it becomes cumbersome with frequent browser updates, making automation with Selenium a more efficient choice. Selenium WebDriver allows for browser-specific testing by utilizing corresponding drivers, but it faces limitations such as lack of support for Windows-based and mobile applications, CAPTCHA handling, and dynamic page loads. To overcome these challenges, leveraging cloud platforms like LambdaTest can provide scalable, parallel testing solutions across multiple browsers and operating systems, enhancing the efficiency of Selenium test automation. Cloud-based testing ensures compatibility and usability across different platforms without the need for extensive local infrastructure, making it a strategic choice for comprehensive cross-browser testing.