This used to work for Firefox 46, and I'm assuming older versions, however it no longer works because support for Firefox Webdriver has now been dropped. If you're using Firefox 47 or newer, then starting up Firefox browser with a simple
If you're looking for where to downlad the new 'firefoxdriver' (its called the Marionette Driver, but the file is called geckodriver), you'll have to download the file directly from its github release page: (I suggest downloading v0.9.0, since v0.10.0 hasn't worked for me). My hypothesis as to why it's not working: You're trying to spawn an instance of firefox, through selenium, but it's not working. That answers the question, I believe, however I'd like to try to address the issue you're having. It's described here:, and it's made available here Maybe firefoxdriver is not available, because the file is now called geckodriver, but it's really called Marionette Driver. But first, to answer the question as to where you can download firefoxdriver, my answer would be I'm not certain if this will fix the issue you're having, but you can give it a try.
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