How to disable Chrome's save password bubble for Selenium tests

When filling out forms in Selenium tests, Chrome shows the (usual) bubble, asking to store those credentials.

While the bubble does not interfere with tests, it is annoying when debugging tests. Here are two ways to disable it:

Option 1: prefs

You can set profile preferences to disable the password manager like so:

Copyprefs = {
  'credentials_enable_service' => false,
  'profile.password_manager_enabled' => false
}

Capybara::Selenium::Driver.new(app, browser: :chrome, prefs: prefs)

Sadly, there are no command line switches for this.

Option 2: Incognito mode

Alternatively, use Incognito mode to make the bubble go away.

CopyCapybara::Selenium::Driver.new(app, browser: :chrome, args: %w[--incognito])

Note that Incognito mode may have other impacts.