the mechanism used to drive the browser is now part of Mozilla Firefox itself. Just like the other BrowserDriversavailable to Selenium from other browser vendors, from Firefox 48.0 onwards, Mozilla itself (instead of Selenium project) has developed a new Firefox driver called Marionette-based Geckodriver, i.e. Then how to automate Firefox > 48.0 with Selenium 3.0.0 Beta? This, in turn, renders the extension inoperable, and thus Selenium can no longer communicate with Firefox using this legacy FirefoxDriver.

The Selenium WebDriver Firefox extension introduces several valid security concerns for the browser, and as such, will not be signed by Mozilla’s security team.

The most important being – all browser extensions must be signed by Mozilla before the browser will allow them to load. Why? Mozilla has introduced two new features in Firefox browser that has disabled the legacy FirefoxDriver. Current Scenario: Starting Selenium 3.0.0 Beta and Firefox browser version > 48.0, you will no longer be able to use the legacy FirefoxDriverprovided by the Selenium project.This extension is installed in the profile used by the driver when WebDriver launches Firefox. The legacy driver is implemented as a Firefox extension. Earlier Scenario: To use Firefox with Selenium, use the “old” legacy Selenium FirefoxDriver provided and maintained by the Selenium project.If you are getting the above error, you must have downloaded Selenium 3.0.0 Beta and Firefox browser version > 48.0. The latest version can be downloaded from What has changed now? What has changed now? What is gecko and what’s the relation with Selenium scripting? Exception in thread “main” : The path to the driver executable must be set by the system property for more information, see. WHAT! It used to work perfectly fine with Selenium 2.0. Many of you must have encountered a geckodriver error as you start scripting for Mozilla Firefox using the latest Selenium 3.0.0 Beta release.

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