- Removed legacy FirefoxDriver components, the promise manager, and support for OperaDriver/PhantomJS, marking several APIs as deprecated (e.g., RemoteWebDriver start/stop client, EdgeDriver constructors).
- Introduced W3C‑compliant actions API, mutable/immutable capabilities handling, insecure certificate option for Chrome, and headless mode support for Firefox.
- Updated various language bindings (Ruby, Python, JavaScript, .NET) with new capabilities, JSON handling improvements, and dependency bumps (e.g., Gson 2.8.2, Node >=8.6.0).
Selenium 3.7.0
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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.