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Problem: The Zen browser was experiencing random crashes when switching tabs, particularly when creating a new tab with Ctrl+T and typing a URL. The crash logs showed "CompositorBridgeChild receives IPC close with reason=AbnormalShutdown" errors, indicating issues with the graphics compositor during tab switching operations. This was caused by race conditions in the tab switching code and lack of proper error handling when dealing with browser elements that might be in an invalid state. Solution: Instead of just catching errors, we've implemented a more robust solution that addresses the root causes of the race conditions in the tab switching code: 1. State Management System: - Added a queue-based system for tab operations to ensure they execute in sequence - Implemented debouncing to prevent rapid tab switching that could cause race conditions - Added state validation before operations to ensure browser elements are in a valid state 2. Asynchronous Operation Handling: - Used Promises and async/await for proper sequencing of operations - Added proper timing controls with small delays to ensure DOM is ready - Implemented a mutex-like approach to prevent concurrent workspace changes 3. Robust Tab State Validation: - Added comprehensive checks for tab validity before operations - Implemented proper cleanup of resources to prevent memory leaks - Added validation for browser window state to prevent operations on closed windows 4. Improved Error Recovery: - Added fallback mechanisms when operations fail - Implemented proper cleanup of state even when errors occur - Added more informative error messages for better debugging These changes make the browser much more robust when handling tab switching operations, preventing the crashes reported in issue #7716.
Zen Browser
✨ Experience tranquillity while browsing the internet with Zen! Our mission is to give you a balance between speed, privacy and productivity!
🖥️ Compatibility
Zen is currently built using Firefox version 137.0.2! 🚀
Zen Twilight- Is currently built using Firefox versionRC 137.0.2!- Check out the latest release notes!
- Part of our mission is to keep Zen up-to-date with the latest version of Firefox, so you can enjoy the latest features and security updates!
🤝 Contribution
Zen is an open-source project, and we welcome contributions from the community! Please take a look at the contribution guidelines before getting started!
Issue metrics
We keep track of how many issues are closed at the end of the month in docs/issue-metrics. We use this to keep track of our issues and see our progress! 📈
Versioning
Zen uses Semantic Versioning, meaning versions are displayed as a.b.cd where:
ais the major versionbis the minor versioncis the branch prefixdis the patch version
Branches
Zen is divided into 2 main branches. We use dev for development and stable for stable releases. The dev branch is where all the new features are added and where twilight builds are generated. The stable branch is where the stable releases are generated.
We divide into 2 branches in case there's any really important security update (for example) that needs to be released before the next stable release. This allows us to do patches without releasing unstable versions to the public.
⚡ Performance
Zen is built with performance in mind, and we have optimized the browser to be as fast as possible! Checkout the latest performance benchmarks!
📥 Installation
Supported Operating Systems
Zen is available for Linux, macOS, and Windows. You can download the latest version from the official website at zen-browser.app, or from the GitHub Releases page.
If you don't see your OS listed below, that's because we already have it in our downloads page! Make sure to check it out!
Windows
Winget
winget install --id Zen-Team.Zen-Browser
macOS
- Requires macOS 10.15 or later
- Available for ARM and Intel architectures
You can also install Zen using Homebrew:
brew install zen-browser
Linux
Arch-based distributions
yay -S zen-browser-bin
Other Linux distributions (Tarball or AppImage)
Tarballinstall:
bash <(curl -s https://updates.zen-browser.app/install.sh)
AppImageinstall:
bash <(curl https://updates.zen-browser.app/appimage.sh)
AppImage install requires
zsyncfor the Update feature
- Again, if you don't see your OS listed above, that's because we already have it in our downloads page! 🔄
To upgrade the browser to a newer version, use the embedded update functionality in About Zen.
👨💻 Development and Contributing
Some components used by @zen-browser as an attempt to make firefox forks a better place, and for other to enjoy the beauty of OSS. You can find them here.
Run Locally
In order to download and run Zen locally, please follow these instructions.
Special Thanks
Special thanks to... EVERYONE 🎉! Checkout the team and contributors page here
Third Party Code
Zen couldn't be in its current state without the help of these amazing projects! 🙏
- Zen's default preferences are based on BetterFox
- Gradient image extracted from Arc Palette
icons.csshas been modified from Edge Firefox (MIT licensed file).
🖥️ Comparison with other browsers
Thanks everyone for making Zen stand out among these giants!
📄 License
Zen browser is under the MPL 2.0 LICENSE. All the code is open-source and free to use! Attribution is appreciated but not required.