Firefox beta includes dozens of major features and improvements - by testing them early we'll be able to respond to your feedback for future versions of Firefox. Once you download Firefox, you're part of our beta program and will receive regular updates as more features launch.
Mozilla Firefox 15 beta is in the Web Browsers category of the Browsers section.
What is new in this release:
Version 50.0 b9 may include unspecified updates, enhancements, or bug fixes.
What is new in version 50.0 b1:
- Find in page now supports a mode to search for whole words only
- New preference for allowing Ctrl+Tab to cycle through tabs in recently used order
- Improved printing by using the Reader Mode
- Fixed rendering of dashed and dotted borders with rounded corners (border-radius)
- Emoji for everyone! Firefox will use built-in Emoji on operating systems without native Emoji fonts (Windows 8.0 and lower and Linux)
- Use accel-(opt/alt)-r as the reader mode keyboard shortcut
What is new in version 48.0 b1:
- Enhanced protection against malware downloads
- New design of the URL bar result panel with more results
- Skia, the graphic library, enabled by default on GNU/Linux for better canvas performances
- Tab and Shift+F10 are now also supported in Firefox customization mode
- Fixed Jabra headset and Logitech C920 webcam audio issue; users heard a frequency distorted (i.e. "Mickey Mouse") voice (WebRTC)
- Improved step debugging on last line of functions
- Ending support for Firefox on OS X 10.6, 10.7, and 10.8
- Removed integration with Windows Remote Access Service modem Autodial
- WebRTC improvements
What is new in version 47.0 b6:
- Support for Google’s Widevine CDM on Windows and Mac OS X so streaming services like Amazon Video can switch from Silverlight to encrypted HTML5 video
- Embedded YouTube videos now play with HTML5 video if Flash is not installed
- Added support for ChaCha20/Poly1305 cipher suites
- Enable VP9 video codec for users with fast machines
- New Devtools for Service Workers adds a button to start registered SWs
- Allow users to view and debug all the registered SWs in about:debugging#workers
- Functionality in about:debugging to simulate Push messages for testing
- Smart multi-line input in the Web Console
- Review Firefox performance data in about:performance
- WebCrypto: RSA-PSS signature support
- Allow no-cache on back/forward navigations for https resources
- The Firefox click-to-activate plugin whitelist has been removed.
- FUEL (Firefox User Extension Library) has been removed, add-ons relying on it will stop working, use add-on SDK instead
- The browser.sessionstore.restore_on_demand preference has been reset to its default value (true) to avoid e10s performance problems
- WebCrypto: PBKDF2 supports SHA-2 hash algorithms
What is new in version 46.0 b7:
Version 46.0 b7 may include unspecified updates, enhancements, or bug fixes.
What is new in version 45.0 b9:
Version 45.0 b9 may include unspecified updates, enhancements, or bug fixes.
What is new in version 45.0 b2:
- Instant browser tab sharing through Hello.
- GTK3 integration (GNU/Linux only).
- Synced Tabs button in button bar.
- Tabs synced via Firefox Accounts from other devices are now shown in dropdown area of Awesome Bar when searching.
- Introduce a new preference (network.dns.blockDotOnion) to allow blocking .onion at the DNS level.
- URLs containing a Unicode-format Internationalized Domain Name (IDN) are now properly redirected.
- Tab Groups (Panorama) feature removed.
What is new in version 42.0 b8:
Version 42.0 b8 may include unspecified updates, enhancements, or bug fixes.
What is new in version 41.0 b9:
Version 41.0 b9 may include unspecified updates, enhancements, or bug fixes.
What is new in version 40.0 b2:
Version 40.0 b2 may include unspecified updates, enhancements, or bug fixes.
What is new in version 40.0 b1:
- Support for Windows 10 including tablet mode
- Download protection from potentially unwanted software
- Suggested Tiles show sites that may be of interest, based on categories from your recent browsing history
- Add URLs to a Hello conversation for additional context
- New style for add-on manager based on the in-content preferences style
- Smoother and more reliable CSS animations via asynchronous animations
- Improved scrolling, graphics, and video playback performance with off main thread compositing (GNU/Linux)
- Add-on extensions that are not signed by Mozilla will display a warning
- Smoother animation and scrolling with hardware vsync (Windows only)
- JPEG images use less memory when scaled and can be painted faster
What is new in version 38.0.5b3:
Version 38.0.5b3 may include unspecified updates, enhancements, or bug fixes.
What is new in version 34.0b4:
Version 34.0b4 may include unspecified updates, enhancements, or bug fixes.