Why Firefox requires GeckoDriver?

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Addressing your questions one by one:

  1. Why does Firefox require GeckoDriver? – For Mozila Firefox till version 47.x it was the legacy browser and we didn’t need gecko driver. Mozila Firefox from version 47.x onwards it comes with Marionette, which is an automation driver for Mozilla’s Gecko engine. It can remotely control either the UI or the internal JavaScript of a Gecko platform, such as Firefox.

  2. With Chrome and IE works out of the box – Ideally neither Chrome nor IE should have worked. But as you have added the location of the binaries in the Environment Variables knowingly/unknowingly while installation/configuration of Google Chrome & MS Internet Explorer or other dependent softwares, those binaries are easily located & used automatically.

  3. Why only for Firefox do we have to download/configure this driver? – It is not only Firefox but also for Google Chrome & MS Internet Explorer to work with Selenium 3.4.0 you need to mandatory download gecko driver v0.16.0 (or above) from this location or Chrome driver or IEDriverServer and save it in your machine. Upgrade your Mozila Firefox or Google Chrome or MS Internet Explorer to the latest stable version. Use the absolute path of the geckodriver/chromedriver/iedriver in your code while System.setProperty as follows:

    System.setProperty("webdriver.gecko.driver",  "C:\\Utility\\BrowserDrivers\\geckodriver.exe");

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