Marionette Harness

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library 5.0.0 ·python
verified May 9, 2026

Marionette Harness is a Python test automation framework for Firefox's Marionette protocol, used for Gecko-based browser automation. The current version is 5.0.0, released with support for Python 3 and asynchronous test execution. Release cadence is irregular, tied to Firefox releases.

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