The `add_argument` method in `selenium.webdriver.firefox.options.Options` is used to add a command-line argument to the options for Firefox browser. Command-line arguments are additional arguments that can be passed to the browser at the time of launching it. These arguments can be used to configure various settings or enable specific features of the browser. Using this method, you can add arguments like user-agent, proxy settings, disable notifications, etc., to customize the behavior of the Firefox browser when automated using Selenium.
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