When I wrote this article, the latest stable jar file is selenium-server-standalone-3.141.59.jar.If you want to get the latest stable selenium server standalone jar file, you can go to the page in Selenium Server ( Grid ) section, because the selenium server standalone jar file is usually used in the selenium grid.This is the Firefox web browser download link. You can download the jar file which is most fit your web browser. Not all the versions run well with the Firefox browser. There are different versions of selenium server standalone jar files.Please note not all version folder contains the selenium server standalone jar file.Go to the selenium release download page to download the selenium server standalone jar file in the version folder that meets your needs.Download The Selenium Server Standalone Jar File Which Includes The Webdriver API.