But when I install the mink driver, I need to use a token:
$composer require --dev dmore/behat-chrome-extension -o --no-progress
GitHub API limit (0 calls/hr) is exhausted, could not fetch https://api.github.com/repos/moodlehq/php-webdriver. Create a GitHub OAuth token to go over the API rate limit. You can also wait until ? for the rate limit to reset.
No token given, aborting.
Your GitHub credentials are required to fetch private repository metadata (https://github.com/moodlehq/php-webdriver.git)
Any reason why this repository uses private metadata?