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For Firefox-specific options (like command-line args and browser about:config prefs), the property to use is moz:firefoxOptions. That is shipping in the latest default nightwatch.conf.js file, as is the parallel goog:chromeOptions for chromedriver. But if you've got a legacy configuration file—like I did—you'll want to update the old chromeOptions property, too.
I’ll get right to it: both the stock Nightwatch configuration file (as of at least Nightwatch v. 2.0.9) and the Nightwatch docs are inaccurate for using the geckodriver web driver (specifically, v. 0.30.0) to run tests. Here is what you need to do, isolated to the firefox environment portion of the test_settings object in a nightwatch.conf.js file: