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‎website_and_docs/content/blog/2025/selenium-4-36-released.md‎

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## 🚩 Highlights
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- **Chrome DevTools support** is now: v140, v139, and v138.
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- **Expanded BiDi Support**:
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- New events and modules added across Python, Java, .NET, and Ruby (e.g. `downloadEnd`, navigation, cookies, network collectors, WebExtensions).
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- **Selenium Grid**:

‎website_and_docs/content/blog/2025/selenium-4-37-released.md‎

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---
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title: "Selenium 4.37 Released!"
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linkTitle: "Selenium 4.37 Released!"
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date: 2025-10-16
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tags: [ "selenium" ]
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categories: [ "releases" ]
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author: Diego Molina [@diemol](https://www.diemol.com)
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images:
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- "/images/blog/2025/selenium_4.37.jpg"
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description: >
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Today we're happy to announce that Selenium 4.37 has been released!
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---
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We’re excited to announce the release of **Selenium 4.37** for JavaScript, Ruby, Python, .NET, Java
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and the Grid! 🎉
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Links to all assets can be found on our [downloads page][downloads].
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---
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# Selenium 4.37 Released
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Selenium 4.37 continues the work on WebDriver BiDi across bindings, improves CI reliability and
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platform support, and delivers several cleanups and internal refactors. This release also tightens
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type safety, modernizes APIs, and removes legacy functionality that had been deprecated for some
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time.
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---
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## Highlights
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- **Chrome DevTools support** is now: v141, v140, and v139.
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- **BiDi Expansion in .NET**: Emulation, downloads, network commands, and major internal performance and serialization improvements.
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- **Python Platform and CI Updates**: Python 3.14 support, Python 3.9 dropped, and Windows fully restored in CI.
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- **Java Reliability Improvements**: Better error reporting during session creation and new HTTP client capabilities.
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- **Grid Stability**: Event bus heartbeat added to prevent stale or stolen connections.
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- **Cleanup of Deprecated APIs**: Removal of obsolete FTP proxy support and other long-deprecated paths.
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---
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## Language-specific Changes
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### Java
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- Improved error handling:
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- Remote session creation errors now properly surface underlying causes.
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- Added **NullAway** static analysis for improved null-safety.
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- Introduced native **Java 11 HTTP client methods** to the `HttpClient` interface.
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- Refactored remote command logic to reduce duplication.
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- Made BiDi and DevTools augmentation lazy-loaded.
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- Added JSpecify annotations for:
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- `org.openqa.selenium.grid.jmx`
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- `org.openqa.selenium.bidi.permissions`
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- Fixed ARM Linux architecture detection (`aarch64`).
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- Documentation typo fix in `invisibilityOf`.
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---
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### Python
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- **Platform support**:
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- Added support for Python 3.14.
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- Dropped support for Python 3.9.
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- BiDi improvements:
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- Added tests for classic navigation request handlers.
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- Fixed default `rpId` in virtual authenticator.
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- Raised `NotImplementedError` for unsupported download deletion.
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- Configuration and stability:
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- WebSocket timeout and wait interval now configurable via `ClientConfig`.
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- Chromium kwargs defaults restored.
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- MIME types now guessed when serving content via the webserver.
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- CI and testing:
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- Windows re-enabled in CI workflows.
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- Added unit test jobs and Windows integration tests.
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- Internal Remote tests now use Chrome instead of Firefox.
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- Code quality:
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- Extensive mypy fixes.
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- Updated docstrings to Google style guidelines.
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- Removed legacy Travis CI xfail markers.
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---
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### .NET
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- **Major BiDi enhancements**:
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- Emulation module support.
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- Download events and `SetDownloadBehaviour`.
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- Network commands including `SetExtraHeaders`.
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- Added `Request` data type in Network module.
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- Performance and correctness:
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- Faster message deserialization.
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- Immediate type info during serialization.
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- Replaced lazy caching with eager initialization.
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- AOT-safe enum serialization.
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- Correct handling of negative zero responses.
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- API cleanup:
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- Removed obsolete `FtpProxy`.
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- Removed unnecessary command type metadata.
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- Introduced specific result types per command.
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- Infrastructure:
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- Improved support for copying Selenium Manager binaries in .NET Framework projects.
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---
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### Ruby
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- Updated Chrome and Edge arguments used in test environments.
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- Removed `prism` dependency.
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- Removed JSON version constraint.
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- BiDi:
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- Removed Firefox guard for download event listening.
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- Test suite fixes and general cleanup.
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---
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### Selenium Grid
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- Added **event bus heartbeat** to prevent stale or stolen connections between components.
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- Continued internal stability and connection management improvements.
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---
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## Build, CI, and Tooling
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- Stress tests split for better isolation and reliability.
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- CI workflows updated and stabilized across platforms.
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- Internal file structure adjustments to match browser protocol changes.
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- Version metadata handling cleaned up in PDL files.
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---
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### 🐳 Docker Selenium
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- Docker: Switch supply chain to get backward Chrome versions deb binary
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- Update Helm release postgresql to v18 (#2980)
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- Update Helm release redis to v23 (#2981)
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- Update softprops/action-gh-release action to v2.4.0 (#2982)
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- chore(deps): update dependency python to 3.14 (#2983)
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- chore(deps): update ubuntu:noble docker digest to 66460d5 (#2989)
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- chore(deps): update helm release kube-prometheus-stack to v78 (#2985)
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- Docker: Roll back default value of `SE_DISTRIBUTOR_SLOT_SELECTOR` as empty (#2993)
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- K8s: Instead of probe to restart Distributor, adding event bus heartbeat to prevent steal connection (#2995)
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- [See all changes](https://github.com/SeleniumHQ/docker-selenium/releases)
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<br>
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We thank all our contributors for their incredible efforts in making Selenium better with every
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release. ❤️
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For a detailed look at all changes, check out
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the [release notes](https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.37.0).
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<br>
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## Contributors
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**Special shout-out to everyone who helped the Selenium Team get this release out!**
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### [Selenium](https://github.com/SeleniumHQ/selenium)
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<div class="d-flex justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/Earlopain" >}}
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{{< gh-user "https://api.github.com/users/diemol" >}}
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{{< gh-user "https://api.github.com/users/ethbra" >}}
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{{< gh-user "https://api.github.com/users/iampopovich" >}}
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{{< gh-user "https://api.github.com/users/manuelsblanco" >}}
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{{< gh-user "https://api.github.com/users/mk868" >}}
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{{< gh-user "https://api.github.com/users/mkurz" >}}
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{{< gh-user "https://api.github.com/users/nnnnoel" >}}
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{{< gh-user "https://api.github.com/users/rpallavisharma" >}}
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</div>
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</div>
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</div>
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### [Selenium Docs & Website](https://github.com/SeleniumHQ/seleniumhq.github.io)
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/Benjamin-Loison" >}}
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</div>
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</div>
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</div>
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### [Docker Selenium](https://github.com/SeleniumHQ/docker-selenium)
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/VietND96" >}}
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</div>
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</div>
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</div>
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### [Selenium Team Members][team]
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**Thanks as well to all the team members who contributed to this release:**
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/aguspe" >}}
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{{< gh-user "https://api.github.com/users/asolntsev" >}}
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{{< gh-user "https://api.github.com/users/AutomatedTester" >}}
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{{< gh-user "https://api.github.com/users/bonigarcia" >}}
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{{< gh-user "https://api.github.com/users/cgoldberg" >}}
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{{< gh-user "https://api.github.com/users/diemol" >}}
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{{< gh-user "https://api.github.com/users/harsha509" >}}
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{{< gh-user "https://api.github.com/users/joerg1985" >}}
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{{< gh-user "https://api.github.com/users/nvborisenko" >}}
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{{< gh-user "https://api.github.com/users/p0deje" >}}
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{{< gh-user "https://api.github.com/users/pujagani" >}}
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{{< gh-user "https://api.github.com/users/RenderMichael" >}}
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{{< gh-user "https://api.github.com/users/shbenzer" >}}
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{{< gh-user "https://api.github.com/users/shs96c" >}}
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{{< gh-user "https://api.github.com/users/titusfortner" >}}
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{{< gh-user "https://api.github.com/users/VietND96" >}}
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</div>
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</div>
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</div>
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Stay tuned for updates by following SeleniumHQ on:
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- [Mastodon](https://mastodon.social/@[email protected])
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- [BlueSky](https://bsky.app/profile/seleniumconf.bsky.social)
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- [LinkedIn](https://www.linkedin.com/company/selenium/)
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- [Selenium Community YouTube Channel](https://www.youtube.com/@SeleniumHQProject/streams)
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- [X (Formerly Twitter)](https://twitter.com/seleniumhq)
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Happy automating!
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[downloads]: /downloads
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[bindings]: /downloads#bindings
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[team]: /project/structure
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[BiDi]: https://github.com/w3c/webdriver-bidi

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