- Added support for Firefox WebExtensions, introduced Firefox Options and ChromeOptions classes, and added Chrome network emulation in Python bindings.
- Implemented extensive W3C WebDriver spec compliance across drivers and the Selenium server, including dual OSS/W3C dialect handling and a new /status endpoint.
- Fixed numerous resource leaks and test stability issues; added a simple deprecation API and updated documentation for new options.
Selenium 3.5.0
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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.