# Configuration ```{eval-rst} .. include:: includes/redirect-banner.rst ``` [ [src] ](https://github.com/yashaka/selene/blob/master/selene/config.py) This class contains different configuration options to configure execution of Selene-based tests, e.g.: + ```timeout```: waiting timeout in seconds, that is used in explicit (should/should_not/wait_for) and implicit waiting in Selene; set to 4 ms by default; can be changed for specific tests e.g. ```config.timeout = 6``` + ```app_host``` e.g. ```config.app_host = 'http://chromedriver.storage.googleapis.com'``` + ```browser_name```(by default it`s "firexox") e.g. ```config.browser_name = 'chrome'``` + ```_default_folder``` + ```hold_browser_open``` ...