- Firefox support limited to version 47.0.1 or earlier; newer versions require geckodriver (breaking change)
- Grid stability enhancements: nodes can now offer help, added help servlet, re‑enabled per‑session log gathering, and updated HtmlUnitDriver
- Deprecated Selenium RC classes and Grid1HeartbeatServlet, marking legacy components as obsolete
Selenium 3.0.0
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Added a new transport layer for generated BiDi modules and improved BiDi schema fidelity, including extensible types and validation of primitives.