Selenium “Unable to find a matching set of capabilities” despite driver being in /usr/local/bin

Updating Firefox and Selenium solved it for me. I don’t pretend to have an explanation for the root cause however.

  • Updated Firefox 48 → 53
  • Updated to Selenium 3.4.1

I also reinstalled/updated Geckodriver using Homebrew and explicitly used it as an executable for Selenium WebDriver, but it turned out that it wasn’t necessary to mitigate the “Unable to find matching set of capabilities” error.

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