The Selenium客户端绑定将尝试找到geckodriver从系统可执行PATH。您需要将包含可执行文件的目录添加到系统路径。
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On Unix如果您使用的是 bash 兼容的 shell，则可以执行以下操作将其附加到系统的搜索路径：
export PATH=$PATH:/path/to/geckodriver
On Windows您需要更新 Path 系统变量以将完整目录路径添加到可执行文件。原理和Unix上是一样的。
以下使用任何编程语言绑定启动最新 Firefox 的所有配置均适用于Selenium2明确启用 Marionette。对于 Selenium 3.0 及更高版本，您不需要执行任何操作即可使用 Marionette，因为它是默认启用的。
要在测试中使用 Marionette，您需要更新所需的功能才能使用它。
Java :
由于异常清楚地表明您需要下载最新的geckodriver.exe from here并设置下载的geckodriver.exe它作为带有变量的系统属性存在于计算机中的路径webdriver.gecko.driver在启动 marionette 驱动程序并启动 Firefox 之前，如下所示：-
//if you didn't update the Path system variable to add the full directory path to the executable as above mentioned then doing this directly through code
System.setProperty("webdriver.gecko.driver", "path/to/geckodriver.exe");
//Now you can Initialize marionette driver to launch firefox
DesiredCapabilities capabilities = DesiredCapabilities.firefox();
capabilities.setCapability("marionette", true);
WebDriver driver = new MarionetteDriver(capabilities);
And for Selenium3用于 ：-
WebDriver driver = new FirefoxDriver();
如果您仍然遇到问题，请点击此链接，这将帮助您解决问题
.NET :
var driver = new FirefoxDriver(new FirefoxOptions());
Python :
from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
caps = DesiredCapabilities.FIREFOX
# Tell the Python bindings to use Marionette.
# This will not be necessary in the future,
# when Selenium will auto-detect what remote end
# it is talking to.
caps["marionette"] = True
# Path to Firefox DevEdition or Nightly.
# Firefox 47 (stable) is currently not supported,
# and may give you a suboptimal experience.
#
# On Mac OS you must point to the binary executable
# inside the application package, such as
# /Applications/FirefoxNightly.app/Contents/MacOS/firefox-bin
caps["binary"] = "/usr/bin/firefox"
driver = webdriver.Firefox(capabilities=caps)
Ruby :
# Selenium 3 uses Marionette by default when firefox is specified
# Set Marionette in Selenium 2 by directly passing marionette: true
# You might need to specify an alternate path for the desired version of Firefox
Selenium::WebDriver::Firefox::Binary.path = "/path/to/firefox"
driver = Selenium::WebDriver.for :firefox, marionette: true
JavaScript (Node.js) :
const webdriver = require('selenium-webdriver');
const Capabilities = require('selenium-webdriver/lib/capabilities').Capabilities;
var capabilities = Capabilities.firefox();
// Tell the Node.js bindings to use Marionette.
// This will not be necessary in the future,
// when Selenium will auto-detect what remote end
// it is talking to.
capabilities.set('marionette', true);
var driver = new webdriver.Builder().withCapabilities(capabilities).build();
Using RemoteWebDriver
如果你想使用RemoteWebDriver在任何语言中，这将允许您使用Marionette in Selenium Grid.
Python:
caps = DesiredCapabilities.FIREFOX
# Tell the Python bindings to use Marionette.
# This will not be necessary in the future,
# when Selenium will auto-detect what remote end
# it is talking to.
caps["marionette"] = True
driver = webdriver.Firefox(capabilities=caps)
Ruby :
# Selenium 3 uses Marionette by default when firefox is specified
# Set Marionette in Selenium 2 by using the Capabilities class
# You might need to specify an alternate path for the desired version of Firefox
caps = Selenium::WebDriver::Remote::Capabilities.firefox marionette: true, firefox_binary: "/path/to/firefox"
driver = Selenium::WebDriver.for :remote, desired_capabilities: caps
Java :
DesiredCapabilities capabilities = DesiredCapabilities.firefox();
// Tell the Java bindings to use Marionette.
// This will not be necessary in the future,
// when Selenium will auto-detect what remote end
// it is talking to.
capabilities.setCapability("marionette", true);
WebDriver driver = new RemoteWebDriver(capabilities);
.NET
DesiredCapabilities capabilities = DesiredCapabilities.Firefox();
// Tell the .NET bindings to use Marionette.
// This will not be necessary in the future,
// when Selenium will auto-detect what remote end
// it is talking to.
capabilities.SetCapability("marionette", true);
var driver = new RemoteWebDriver(capabilities);
注意：就像其他浏览器供应商提供给 Selenium 的其他驱动程序一样，Mozilla 现在发布了一个可以与浏览器一起运行的可执行文件。跟随this更多细节。
您可以从这里下载最新的 geckodriver 可执行文件以支持最新的 Firefox
