Selenium IDE is an accessible record and playback tool for automated browser testing that has gained new features like script editing, cross-browser testing, and parallel testing with plugins, making it suitable for comprehensive cross-browser testing. The guide offers practical insights into running Selenium IDE tests on an online Selenium Grid, specifically using LambdaTest. It covers prerequisites such as installing Node.js, NPM, and the Selenium IDE plugin for Chrome or Firefox. The SIDE runner, a command-line tool, facilitates parallel testing on the cloud without needing local browser drivers. Test suites can be exported from Selenium IDE, configured, and executed with the SIDE runner, using a cloud-based platform like LambdaTest for improved efficiency. Configuration files, either default (.side.yml) or custom YAML, simplify the process by storing run-time parameters, eliminating the need to specify them with each command. This approach enhances the effectiveness of automated browser testing, leveraging the parallel execution capabilities of a Selenium Grid platform.