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:
- Lightweight themes are now applied in private browsing windows
- Reader Mode now displays estimated reading time for the page
- On qualified Windows systems, a new 'compositor process' mitigates the risk of device driver related browser crashes
- Windows users can select 32-bit or 64-bit versions in the installer
- Two new 'compact' themes available in Firefox, dark and light, based on the Firefox Developer Edition theme changed
- Windows XP and Vista are no longer supported. XP and Vista users running Firefox 52 will continue to receive security updates for another year.
- 32-bit Mac OS X is no longer supported. Firefox is now a 64-bit only Mac OS X application
- Updates for Mac OS X are smaller in size compared to updates for Firefox 52
- Media playback on new tabs is blocked until the tab is visible
- Permission notifications have a cleaner design and cannot be easily missed
- Shortened titles on tabs are faded out instead of using ellipsis for improved readability
- Refresh of the media controls user interface
- Ended Firefox Linux support for processors older than Pentium 4 and AMD Opteron
What is new in version 52.0 b8:
Version 52.0 b8 may include unspecified updates, enhancements, or bug fixes.
What is new in version 52.0 b2:
- Send and open a tab from one device to another with Sync
- Windows 8 touch screen support for multiprocess Firefox
- Pages containing insecure password fields now display a warning directly within username and password fields.
- Removed Battery Status API to reduce fingerprinting of users by trackers
- Removed NPAPI support for plugins other than Flash. Silverlight, Java, Acrobat and the like are no longer supported.
- Implemented the Strict Secure Cookies spec which forbids insecure (http:) sites from setting cookies with the "secure" attribute, and in some cases prevents an insecure site from setting a cookie with the same name as an existing "secure" cookie from the same base domain.
Improved experience for downloads:
- Notification in the toolbar when a download fails
- Quick access to five most recent downloads rather than three
- Larger buttons for canceling and restarting
Improved text input with some third-party keyboard layouts on Windows, e.g., keyboard layouts which have chained dead keys, inputs two or more characters with a non-printable key or a dead key sequence, inputs a character even when a dead key sequence failed to compose a character.
What is new in version 51.0 b7:
Version 51.0 b7 may include unspecified updates, enhancements, or bug fixes.
What is new in version 51.0 b3:
- Added support for FLAC (Free Lossless Audio Codec) playback
- View passwords from the prompt before saving them
- Zoom indicator is shown in the URL bar if the zoom level is not at default level
- Improved video performance for users without GPU acceleration - less CPU usage and better full screen experience
- Support saving passwords for forms without 'submit' events
- Remove Belarusian (be) locale
- Added support for WebGL 2
- Process separation (e10s) now supported on Windows 10 touch screen devices and systems with accessibility tools installed
What is new in version 50.0 b9:
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.