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Marionette [ ˌmarɪəˈnɛt] is
* a puppet worked by strings: the bird bobs up and down like
a marionette;
* a person who is easily manipulated or controlled: many officers
dismissed him as the mayor’s marionette;
* the remote protocol that lets out-of-process programs communicate
with, instrument, and control Gecko-based browsers.
Marionette provides interfaces for interacting with both the internal
JavaScript runtime and UI elements of Gecko-based browsers, such
as Firefox on desktop and mobile. It can control both the chrome- and content
documents, giving a high level of control and ability to replicate,
or emulate, user interaction.
Head on to the Marionette documentation to find out more:
https://firefox-source-docs.mozilla.org/testing/marionette/