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The Mozilla Firefox Browser

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Firefox

Mozilla Firefox is an open-source web browser developed by Mozilla.

Firefox is available for Windows, macOS, Linux, and Android.

As of January 2018, Firefox is the second most popular web browser.

Firefox uses the Gecko rendering engine.

Download Firefox

Firefox Statistics

The values below are in percentages and are extracted from our W3Schools' Statistics.

2018 Total   FF61 FF60 FF59 FF58 FF57 FF56 FF55 FF54 Older
May 10.9   0.4 4.0 4.1 0.2 0.2 0.2 0.1 0.1 1.6
April 11.2     0.5 7.8 0.4 0.3 0.1 0.1 0.1 1.9
March 11.5     0.3 3.8 4.7 0.5 0.2 0.2 0.1 1.7
February 11.8       0.7 7.5 0.9 0.2 0.2 0.2 2.1
January 12.4       0.2 1.5 7.8 0.3 0.1 0.3 2.2
2017 Total FF58 FF57 FF56 FF55 FF54 FF53 FF52 FF51 FF50 Older
December 12.4 0.7 8.9 0.4 0.2 0.2 0.1 0.7 0.1 0.1 1.0
November 12.5 0.4 4.1 4.7 0.3 0.2 0.1 0.9 0.1 0.1 1.6
October 12.1   0.6 7.1 1.9 0.4 0.2 0.8 0.1 0.1 0.9
September 12.8   0.1 0.6 8.0 0.8 0.2 0.8 0.1 0.1 2.1
August 13.1     0.3 2.6 6.9 0.3 1.0 0.1 0.2 1.7
July 13.3       0.6 9.0 0.4 1.0 0.2 0.2 1.9
June 13.3       0.2 3.6 6.5 0.8 0.2 0.2 1.8
May 13.6         0.6 8.9 0.9 0.2 0.3 2.7
April 13.6         0.3 2.2 7.5 0.5 0.3 2.8
March 14.1         0.1 0.3 5.3 4.5 0.4 3.5
February 15.0           0.1 0.7 9.5 1.1 3.6
January 15.4           0.2 2.9 8.9 3.4
2016 Total FF51 FF50 FF49 FF48 FF47 FF46 FF45 FF44 FF43 Older
December 15.5 0.6 10.3 0.7 0.4 0.7 0.2 1.4 0.3 0.3 0.6
November 15.3 0.3 4.0 7.1 0.5 0.8 0.2 0.8 0.4 0.2 1.0
October 15.7 0.1 0.5 10.0 1.1 1.1 0.2 0.8 0.2 0.4 1.3
September 16.3   0.2 2.4 8.2 1.8 0.3 0.8 0.3 0.4 1.9
August 16.8   0.2 0.6 4.8 7.3 0.4 0.8 0.4 0.4 1.9
July 17.1     0.1 0.9 11.7 0.5 0.9 0.4 0.4 2.2
June 17.0     0.1 0.5 7.5 4.5 0.9 0.4 0.5 3.6
May 16.9       0.1 0.7 9.6 2.5 0.6 0.6 2.8
April 17.5         0.2 1.0 11.5 1.2 0.7 2.9
March 17.8         0.1 0.6 5.2 7.1 1.0 3.8
February 18.6           0.2 0.8 8.8 4.6 4.2
January 18.8             0.2 1.4 12.8 4.4
2015 Total FF44 FF43 FF42 FF41 FF40 FF39 FF38 FF37 FF36 FF35 Older
December 19.1 0.4 4.8 9.3 0.6 0.5 0.4 1.3 0.2 0.1 0.2 2.3
November 19.2   0.7 9.9 4.2 0.8 0.5 1.2 0.2 0.1 0.2 1.4
October 20.0   0.2 0.8 12.7 2.1 0.6 1.3 0.3 0.2 0.3 1.5
September 20.6     0.2 1.9 13.3 1.1 1.4 0.3 0.2 0.4 1.8
August 21.2     0.1 0.6 6.8 7.7 1.2 0.8 0.5 0.6 2.9
July 21.6         0.7 10.6 4.5 0.5 0.7 0.5 4.1
June 21.3         0.2 0.8 14.8 1.0 0.5 0.4 3.8
May 21.5           0.1 7.2 9.2 0.6 0.6 3.9
April 21.6             1.0 12.1 3.9 0.8 3.8
March 22.1             0.2 1.0 13.2 2.8 4.9
February 22.9               0.3 2.0 14.9 5.7
January 23.4                 0.7 8.5 14.2
2014 Total FF34 FF33 FF32 FF31 FF30 FF29 FF28 FF27 FF26 FF25 Older
December 23.6 11.3 6.2 0.6 1.0 0.5 0.3 0.2 0.1 0.2 0.1 3.1
November 23.4 1.2 15.4 2.3 1.1 0.7 0.3 0.2 0.2 0.2 0.1 1.7
October 23.4 0.4 4.0 13.4 1.3 0.6 0.4 0.2 0.2 0.2 0.1 2.6
September 24.0   0.8 10.9 6.7 1.0 0.5 0.3 0.2 0.2 0.2 3.2
August 24.7     1.3 17.0 1.5 0.8 0.4 0.2 0.3 0.2 3.0
July 24.9       3.1 15.6 1.1 0.6 0.2 0.4 0.2 3.7
June 25.1         9.0 10.5 0.7 0.4 0.4 0.2 3.9
May 24.9         0.1 14.2 5.2 0.5 0.5 0.2 4.2
April 25.0           1.1 18.1 1.2 0.7 0.3 3.6
March 25.6           0.3 3.4 16.3 1.0 0.4 4.2
February 26.4             0.6 11.7 8.7 0.6 4.8
January 26.9               1.2 18.9 1.0 5.8
2013 Total FF26 FF25 FF24 FF23 FF22 FF21 FF20 FF19 FF18 FF17 Older
December 26.8 6.9 13.3 1.1 0.5 0.4 0.3 0.4 0.2 0.2 0.5 3.0
November 26.8 1.0 16.2 3.5 0.7 0.5 0.4 0.4 0.3 0.2 0.7 2.9
October 27.2 0.1 1.3 18.4 2.0 0.7 0.4 0.5 0.3 0.4 0.7 2.5
September 27.8 0.1 0.3 3.1 17.5 1.0 0.6 0.5 0.3 0.4 0.9 3.2
August 28.2     0.7 10.8 9.9 1.0 0.7 0.4 0.4 0.8 3.5
July 28.9     0.1 1.2 18.0 3.1 1.0 0.5 0.5 0.8 3.7
June 28.9       0.1 1.7 19.8 1.3 0.7 0.5 0.8 4.0
May 27.7       0.1 0.5 6.5 14.0 0.9 0.6 0.8 4.3
April 27.9         0.1 0.7 12.9 7.3 0.8 0.8 5.9
March 28.5           0.1 0.9 19.0 1.4 0.9 6.2
February 29.6           0.1 0.2 4.6 16.0 1.2 7.5
January 30.2             0.1 0.6 12.4 8.3 8.8
2012 Total FF17 FF16 FF15 FF14 FF13 FF12 FF11 FF 9-10 FF4-8 FF3.6 Older
December 31.1 16.3 5.6 1.3 1.0 0.7 1.1 0.6 1.2 1.2 0.8 1.3
November 31.2 2.5 19.4 1.8 1.2 0.8 1.2 0.6 1.3 1.3 0.8 0.3
October 31.8 0.4 9.5 12.4 1.8 1.0 1.4 0.8 1.4 1.6 1.0 0.5
September 32.2   0.8 17.7 4.8 1.3 1.6 1.0 1.6 1.9 1.2 0.3
August 32.8     1.9 20.3 2.1 1.8 1.1 1.7 2.1 1.2 0.7
July 33.7     0.3 7.4 15.2 3.0 1.3 2.1 2.4 1.5 0.5
June 34.4       0.6 12.1 12.5 1.6 2.3 2.7 1.8 0.8
May 35.2       0.1 0.8 21.4 3.8 2.7 3.4 2.3 0.7
April 35.8         0.1 2.6 21.6 3.8 3.8 3.1 0.8
March 36.3           0.3 9.1 17.3 5.0 3.7 0.9
February 37.1           0.1 0.6 24.2 6.5 4.3 1.4
January 37.2             0.1 18.6 12.4 5.0 1.1
2011 Total   FF 9 FF 8 FF 7 FF 6 FF 5 FF4 FF3.6 FF3.5 FF3.0 Older
December 37.7   1.8 22.8 2.1 1.5 1.2 1.3 5.6 0.6 0.5 0.3
November 38.1   0.4 12.7 11.5 2.2 1.5 1.5 6.9 0.6 0.5 0.3
October 38.7     0.6 19.8 5.1 2.0 1.8 7.9 0.7 0.5 0.3
September 39.7       1.5 22.2 3.1 2.2 9.0 0.7 0.7 0.3
August 40.6         9.5 15.9 2.9 10.3 0.8 0.8 0.4
July 42.0         0.6 23.2 4.6 11.5 0.9 0.9 0.3
June 42.2           5.6 21.5 12.3 1.5 0.9 0.4
May 42.4           0.3 23.4 15.6 1.8 1.0 0.3
April 42.9             15.7 23.8 2.1 1.1 0.2
March 42.2             5.2 32.9 2.5 1.3 0.3
February 42.4             1.9 35.8 2.9 1.5 0.3
January 42.8             1.5 36.1 3.1 1.7 0.4
2010 Total             FF4 FF3.6 FF3.5 FF3.0 Older
December 43.5             1.1 36.5 3.5 2.0 0.4
November 44.0             0.8 36.9 3.8 2.0 0.5
October 44.4             0.7 36.2 4.5 2.4 0.6
September 45.1             0.8 35.3 5.6 2.9 0.5
August 45.8             0.6 35.2 6.1 3.1 0.6
July 46.4             0.4 34.5 7.3 3.6 0.6
June 46.6               32.7 9.1 4.0 0.8
May 46.9               31.7 10.0 4.4 0.8
April 46.4               29.4 11.5 4.6 0.9
March 46.2               22.1 17.6 5.6 0.9
February 46.5               10.5 28.5 6.5 1.0
January 46.3               2.2 34.2 8.6 1.3
2009 Total               FF3.5 FF3.0 FF2.0 Older
December 46.4               33.3 11.2 1.2 0.7
November 47.0               31.4 13.6 1.5 0.5
October 47.5               29.8 15.7 1.6 0.4
September 46.6               27.3 17.2 1.8 0.3
August 47.4               21.0 24.0 1.9 0.5
July 47.9               12.1 33.3 1.9 0.6
June 47.3               1.2 43.4 2.3 0.4
May 47.7                 44.3 2.9 0.5
April 47.1                 43.4 2.8 0.9
March 46.5                 42.2 3.0 1.3
February 46.4                 41.5 3.8 1.1
January 45.5                 39.5 4.6 1.4
2008 Total               FF3.0 FF2.0 FF1.5 Moz
December 44.7               38.1 6.2 0.1 0.3
November 44.6               35.9 8.0 0.3 0.4
October 44.5               34.9 8.7 0.4 0.5
September 43.1               31.9 10.1 0.6 0.5
August 44.2               25.5 17.5 0.7 0.5
July 43.1               20.7 21.1 0.8 0.5
June 41.5               8.9 31.2 0.9 0.5
May 40.5               2.9 35.9 1.0 0.7

Firefox 51

Firefox 51 was released on January 24, 2016.

Firefox 51 is available for Windows, Mac, Linux, and Android.

New features:

  • FLAC support
  • WebGL 2.0 support
  • Show warnings for insecure logins
  • Show password option
  • Adds zoom level indicator
  • Support for the Georgian and Kabyle languages (locale)
  • Improved CPU and video performance for users without GPU acceleration
  • Clipboard access for Web Extensions (replacement for Mozilla Add-ons)

Firefox 50

Firefox 50 was released on November 15, 2016.

Firefox 50 is available for Windows, Mac, Linux, and Android.

New features:

  • Faster startup (improved by 35%)
  • Built-in emojis
  • Find in page: limit to word matches
  • Adds download protection for a long list of executable files
  • WebM EME Support - allowing for streaming video on more sites without plugins
  • Improved SDK performance
  • Support for the Guarani language (locale)
  • Added support for dragging and dropping multiple items via HTML5

Firefox 49

Firefox 49 was released on September 20, 2016.

Firefox 49 is available for Windows, Mac, Linux, and Android.

New features:

  • Removed Firefox Hello
  • Firefox Login manager supports HTTPS logins
  • Reader Mode improvements
  • Ended Firefox for Mac support for OS X 10.6, 10.7, and 10.8
  • Ended Firefox for Windows support for SSE processors
  • Some "non-essential" Flash content will be blocked
  • Supports plug-in Free Netflix and Amazon Video on Linux
  • HTML5 audio and video elements sport two new options: play at 1.25x speed and loop playback

Firefox 48

Firefox 48 was released on August 2, 2016.

Firefox 48 is available for Windows, Mac, Linux, and Android.

New features:

  • Process separation
  • Protection against harmful downloads
  • Add-ons that have not been verified and signed by Mozilla will not load
  • WebRTC improvements
  • The media parser has been redeveloped using the Rust programming language

Firefox 47

Firefox 47 was released on June 7, 2016.

Firefox 47 is available for Windows, Mac, Linux, and Android.

New features:

  • Synced Tabs - Allow anyone logged in their Firefox Sync account to access tabs open on any other synced Firefox device
  • The new about:performance page - Type about:performance in the URL bar. This new page shows the status of currently open tabs and add-ons. Users can use this new page to check out what tab is eating up too much memory, or what add-on is about to crash
  • Custom user agent strings - Users can now set a custom user agent string for each tab. The feature can help users view how various sites would look in other browsers, without having to open those browsers
  • Better video
  • Removed the Firefox click-to-activate plugin whitelist

Firefox 46

Firefox 46 was released on April 26, 2016.

Firefox 46 is available for Windows, Mac, Linux, and Android.

New features:

  • Improved security for the JavaScript Just-In-Time compiler
  • GTK3 integration
  • Correction of the blank spaces (that caused problems for the screen reader in Google Docs)
  • Correct rendering for scaled SVGs that use a clip and mask
  • Security and performance fixes for WebRTC
  • Support for developers to display dominator trees in memory
  • Support for documents.elementsFromPoint
  • Addition of allocation and garbage collection pause profiling to the performance panel
  • HKDF support for Web Crypto API

Firefox 45

Firefox 45 was released on March 8, 2016.

Firefox 45 is available for Windows, Mac, Linux, and Android.

New features:

  • Instant browser tab sharing through Hello
  • 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
  • Guarani [gn] locale added
  • HTML5 - Push API support
  • ES6 classes

Firefox 44

Firefox 44 was released on January 26, 2016.

Firefox 44 is available for Windows, Mac, Linux, and Android.

New features:

  • Firefox can now get Push Notifications from your favorite sites
  • Screenshot commands allow user choice of pixel ratio in Developer Tools
  • Support the brotli compression format via HTTPS content-encoding
  • In the animation-inspector timeline, lightning bolt icon next to animations running on the compositor thread
  • Enable WebM/VP9 video support on systems that don't support MP4/H.264
  • Enable H.264 if system decoder is available
  • Improved warning pages for certificate errors and untrusted connections
  • Removed support for the RC4 cipher
  • WebSocket Debugging API and add-on
  • Built-in JSON reader to intuitively view, search, copy and save data without extensions
  • Service Workers API
  • New memory tool for inspecting the memory heap

Firefox 43

Firefox 43 was released on December 15, 2015.

Firefox 43 is available for Windows, Mac, Linux, and Android.

New features:

  • Private Browsing with Tracking Protection offers choice of blocking additional trackers
  • Improved API support for m4v video playback
  • Firefox 64-bit for Windows is now available via the Firefox download page
  • Users can choose search suggestions from the Awesome Bar
  • On-screen keyboard displayed on selecting input field on devices running Windows 8 or greater
  • Firefox Health Report has switched to use the same data collection mechanism as telemetry
  • CSS3: Unprefixed "hyphens" property is now supported
  • CSS3: The "transform-origin" property is now supported on SVG elements

Firefox 42

Firefox 42 was released on November 3, 2015.

Firefox 42 is available for Windows, Mac, Linux, and Android.

New features:

  • Private Browsing with Tracking Protection blocks certain Web elements that could be used to record your behavior across sites
  • Control Center that contains site security and privacy controls
  • Indicator added to tabs that play audio with one-click muting
  • Login Manager improvements
  • WebRTC improvements
  • View HTML source in a tab
  • Remote website debugging over WiFi (no USB cable or ADB needed)
  • Asynchronous call stacks now allow web developers to follow the code flow through setTimeout, DOM event handlers, and Promise handlers
  • Configurable Firefox OS Simulator in WebIDE, to simulate reference devices like phones, tablets, even TVs
  • CSS filter presets in the Inspector
  • Ability to save filter presets inside CSS Filter Tooltip
  • Implemented ES6 Reflect
  • Support ImageBitmap and createImageBitmap()
  • Media Source Extension for HTML5 video available for all sites

Firefox 41

Firefox 41 was released on September 22, 2015.

Firefox 41 is available for Windows, Mac, Linux, and Android.

New features:

  • Enhance IME support on Windows (Vista +) using TSF (Text Services Framework)
  • Firefox Hello now includes instant messaging
  • SVG images can be used as favicons
  • Added support for the transform-origin property on SVG elements
  • Implemented Cache API for querying named caches that are accessible Window, Worker, and ServiceWorker

Firefox 40

Firefox 40 was released on August 11, 2015.

Firefox 40 is available for Windows, Mac, Linux, and Android.

New features:

  • Support for Windows 10
  • Making Third Party Add-ons Safer
  • HTML5 IndexedDB transactions are now non-durable by default
  • HTML5 now support for CSS Scroll Snap Points
  • Cascading of CSS transitions and animations now matches the current spec

Firefox 39

Firefox 39 was released on July 2, 2015.

Firefox 39 is available for Windows, Mac, Linux, and Android.

New features:

  • Share Hello link with social networks
  • HTML5 list-style-type now accepts a string value
  • HTML5 now support for CSS Scroll Snap Points
  • Cascading of CSS transitions and animations now matches the current spec

Firefox 38

Firefox 38 was released on May 12, 2015.

Firefox 38 is available for Windows, Mac, Linux, and Android.

New features:

  • Responsive image support - now supports both the <picture> element and srcset attribute on images
  • Now allows code running in a Web Worker to open up a WebSocket connection
  • Redesigned Options panel
  • Now supports the Encrypted Media Extensions (EME) API on Windows desktop, and also Automatically downloads Adobe's Content Decryption Module
  • HTML5 <ruby> markup support
  • New Firefox ESR released
  • 13 security fixes

Firefox 37

Firefox 37 was released on March 31, 2015.

Firefox 37 is available for Windows, Mac, Linux, and Android.

New features:

  • Heartbeat user rating system - Firefox's new way for getting feedback from users on how well the browser is performing
  • Animations Panel in Inspector - new tool for working with web animations
  • Bing search will now be using HTTPS for secure searching
  • Fake and fraud websites are better handled - by the new OneCRL centralized certificate revocation

Firefox 36

Firefox 36 was released on February 24, 2015.

Firefox 36 is available for Windows, Mac, Linux, and Android.

New features:

  • Full HTTP/2 support - enables a faster, more scalable, and more responsive web
  • HTML5: Support for meta name="referrer"
  • CSS3 will-change property implemented
  • For Android: New interface

Firefox 35

Firefox 35 was released on January 13, 2015.

Firefox 35 is available for Windows, Mac, Linux, and Android.

New features:

  • Firefox Hello Chat Room
  • Marketplace button - faster access to the Firefox marketplace
  • Native H264 support on OS X 10.6 and above - H264 is a proprietary video encoding format for playing MP4 (MPEG) files
  • For Android: Download Manager added
  • For Android: Search bar on network error page

Firefox 34

Firefox 34 was released on December 1, 2014.

Firefox 34 is available for Windows, Mac, Linux, and Android.

New features:

  • Default Googling is over - Mozilla's lucrative partnership with Google has ended and Firefox users will have an alternative for the 100 billion searches they perform every year
  • Improved search bar
  • Added "Firefox Hello" - a plugin-free video/voice chat based on WebRTC
  • A number of CSS3 Font features have been added
  • JavaScript updates
  • New Storage Inspector - allows you to view site data in cookies, localStorage, sessionStorage and IndexDB
  • App Manager is replaced by WebIDE
  • New Themes button is shown in customize
  • HTTP/2 implementation

Firefox 33

Firefox 33 was released on October 13, 2014.

Firefox 33 is available for Windows, Mac, Linux, and Android.

New features:

  • Improved search experience - speed up search
  • More reliable Session restore
  • New Media sidebar in Style editor - displays a list of shortcuts to every @media rule in the current stylesheet
  • New Paint Flashing Tool
  • For Android: Clear data when quitting Firefox (if you want) - Look under Settings>Privacy

Firefox 32

Firefox 32 was released on September 2, 2014.

Firefox 32 is available for Windows, Mac, Linux, and Android.

New features:

  • Faster HTTP caching by default
  • New public key pinning feature (enables enhanced security for SSL certificate authenticity)
  • View historical use information for logins stored in password manager
  • Display the number of found items in the find toolbar
  • Easier back, forward, reload, and bookmarking through the context menu
  • HTML5 Vibration API updated to latest W3C spec
  • New Web Audio Editor
  • HiDPI support in Developer Tools UI

Firefox 31

Firefox 31 was released on July 22, 2014.

Firefox 31 is available for Windows, Mac, Linux, and Android.

New features:

  • Block malware from downloaded files
  • A new search box to the New Tab page
  • Automatically handle PDF files and audio/video .ogg files internally (for Windows users)
  • New certificate verification library (mozilla:pkix)
  • Support for HTML5 WebVTT (allow users to watch video content with embedded subtitles)
  • Support for CSS3 variables
  • Developer tools: Add-on Debugger
  • Developer tools: Canvas Debugger
  • Developer tools: Eyedropper tool added to the color picker
  • Removal of the CAPS infrastructure for specifying site-specific permissions

Firefox 30

Firefox 30 was released on June 10, 2014.

Firefox 30 is available for Windows, Mac, Linux, and Android.

New features:

  • Sidebars button enables faster access to social, bookmark, and history sidebars
  • Mac users can now use Command-E to search a Web page for the current text selection
  • The Android version of Firefox adds Quickshare buttons to the context menu
  • Support for GStreamer 1.0 (for multimedia streaming)
  • Fixes to CSS box-shadow
  • Mute/Volume available per window when using WebAudio
  • Support for CSS line-height property on <input type="reset|button|submit">
  • Support for alpha option in canvas context options

Firefox 29

Firefox 29 was released on April 29, 2014.

Firefox 29 is available for Windows, Mac, Linux, and Android.

New features:

  • A few re-designed tools and a refreshed interface
  • Enhanced Firefox Sync service
  • The menu is moved to the right corner
  • New "Customization tool" where you can move features or add-ons or add on
  • Users can now create a bookmark with a single click
  • Support for CSS box-sizing property (without -moz- prefix)
  • Support for HTML5 input type="number"
  • Support for HTML5 input type="color"

Firefox 28

Firefox 28 was released on March 18, 2014.

Firefox 28 is available for Windows, Mac, Linux, and Android.

New features:

  • Mac OS X: Notification Center support for web notifications
  • Horizontal HTML5 audio/video volume control
  • Support for Opus in WebM
  • VP9 video decoding implemented
  • Support for MathML 2.0 'mathvariant' attribute
  • Background thread hang reporting
  • Support for multi-line flexbox in layout

Firefox 27

Firefox 27 was released on February 4, 2014.

Firefox 27 is available for Windows, Mac, Linux, and Android.

New features:

  • A major update to the Firefox Social API - now allows users to run more than one service at a time
  • Support for Google's SPDY 3.1 protocol and Transport Layer Security (TLS) versions 1.1 and 1.2 - These are essentially the successors of the well-known SSL cryptographic protocol
  • Ability to reset style sheets using "all:unset"
  • Support for scrolled fieldsets
  • CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed
  • Support for mathematical function Math.hypot()
  • Dashed line support on Canvas

Firefox 26

Firefox 26 was released on December 10, 2013.

Firefox 26 is available for Windows, Mac, Linux, and Android.

New features:

  • All Java plug-ins are defaulted to "click to play"
  • Password manager now supports script-generated password fields
  • Support for H.264 encoded video on Linux
  • MP3 audio is supported on Windows XP (this completes MP3 support across Windows OS versions)
  • Removed the prompt when a site requests the AppCache
  • Support for the CSS3 image-orientation property
  • New App Manager allows you to deploy and debug HTML5 webapps on Firefox OS phones and the Firefox OS Simulator
  • IndexedDB can now be used as a "optimistic" storage area (doesn't require any prompts and data is stored in a pool with LRU eviction policy, in short temporary storage)
  • Reduced memory usage and image handling improvements

Firefox 25

Firefox 25 was released on October 29, 2013.

Firefox 25 is available for Windows, Mac, Linux, and Android.

New features:

  • Web Audio support
  • CSS3 background-attachment:local support
  • iframe document content can now be specified inline
  • Many new ECMAScript 6 functions are available
  • The Profiler tool can save and import test results

Firefox 24

Firefox 24 was released on September 17, 2013.

Firefox 24 is available for Windows, Mac, Linux, and Android.

New features:

  • Enabled support for WebRTC (on Android)
  • NFC sharing on Android
  • Option to mass close tabs "to the right"
  • New scrollbar style on OS X 10.7
  • Ability to tear-off chat windows to view separately by simply dragging them out
  • Major SVG rendering improvements around Image tiling and scaling
  • Improved Browser console for enhanced debugging experience, replacing existing Error console
  • Removed support for Revocation Lists feature
  • Removed support for sherlock files that are loaded from application or profile directory

Firefox 23

Firefox 23 was released on August 07, 2013.

Firefox 23 is available for Windows, Mac, Linux, and a mobile version for Android.

New features:

  • New logo
  • Mixed content blocker - prevents reading the non-secured content on web by completely blocking the URL
  • Share button - let users share content with friends/family in just one click
  • Network monitor tool for developers - breaks down website components and notifies the developer about load timings

Firefox 22

Firefox 22 was released on June 25, 2013.

Firefox 22 is available for Windows, Mac, Linux, and a mobile version for Android.

New features:

  • Fixed 14 security issues
  • WebRTC is now enabled by default
  • OdinMonkey - Improves JavaScript performance
  • HTML5 audio/video playback rate can now be changed
  • New display scaling option that is enabled by default - renders larger text on high-resolution displays
  • Word wrap for text files

Firefox 21

Firefox 21 was released on May 14, 2013.

Firefox 21 is available for Windows, Mac, Linux, and a mobile version for Android.

New features:

  • Firefox Health Report - A tool for tuning up the browser
  • Improved Startup Time
  • HTML5 <main> element support
  • Scoped stylesheets support
  • Three "Do Not Track" options: "Do Track", "Do Not Track", and "No Preference"
  • Expanded Social API - Added new social providers: Cliqz, Mixi and msnNOW,  and Facebook Messenger for Firefox

Firefox 20

Firefox 20 was released on April 2, 2013.

Firefox 20 is available for Windows, Mac, Linux, and a mobile version for Android.

New features:

  • New Download Manager
  • Per-window Private Browsing
  • View Developer tools in a separate window
  • Ability to close hanging plugins, without the browser hanging
  • <canvas> now supports blend modes
  • Various <audio> and <video> improvements

Firefox 19

Firefox 19 was released on February 20, 2013.

Firefox 19 is available for Windows, Mac, and Linux.

New features:

  • New built-in PDF viewer - Now you can read PDFs without needing a plugin
  • @page support for printed documents
  • Export canvas content to an image - The content of a canvas element can be exported to an image blob with toBlob()
  • Implemented CSS viewport-percentage length units (vh, vw, vmin and vmax)
  • Support for CSS text-transform:full-width
  • Faster start-up
  • XForms has been removed

Firefox 18

Firefox 18 was released on January 8, 2013.

Firefox 18 is available for Windows, Mac OS X (Snow Leopard, Lion, and Mountain Lion), Linux, and Android.

New features:

  • IonMonkey - New JavaScript compiler (7 - 26 faster than Firefox 17)
  • Support for Retina displays
  • Inline PDF viewer
  • Preliminary support for Web Real Time Communication (WebRTC)

Firefox 17

Firefox 17 was released on November 20, 2012.

Firefox 17 is available for Windows, Mac OS X, Linux, and Android.

New features:

  • Updated Awesome Bar - with larger icons
  • Tab animations
  • Social API - Allows you to sign in to your social networks (Facebook) via your browser
  • Implemented Click-To-Play blocklisting - to prevent vulnerable plugin versions from running without the user's permission
  • New Markup Panel For HTML/DOM in Page Inspector
  • HTML5 sandbox attribute (for iframes) implemented
  • Support for Mountain Lion’s Notification Center

Firefox 16

Firefox 16 was released on October 9, 2012.

Firefox 16 is available for Windows, Mac OS X, Linux, and Android.

New features:

  • Native support for PDFs
  • New Developer Toolbar (lets you access the Web Console, Inspector and Debugger + the toolbar itself supports some commands)
  • VoiceOver support for OS X
  • Web App Support (start using apps in the Mozilla app directory)
  • Incremental Garbage Collection (speeds up your browser - recycles/reuses memory that a JavaScript program is no longer using)
  • CSS3 Animations, Transitions, Transforms and Gradients unprefixed in Firefox 16

Firefox 15

Firefox 15 was released on August 28, 2012.

Firefox 15 is available for Windows, Mac OS X, Linux, and Android.

New features:

  • Seamless background updates
  • Stopped most memory leaks caused by add-ons
  • Support for the SPDY networking protocol v3
  • WebGL enhancements
  • HTML5 - Support for the media attribute in <source>
  • HTML5 - Support for the played attribute in <audio> and <video>
  • CSS3 - Support for the CSS word-break property
  • Faster debugger
  • New design tool that allows web developers to switch between desktop and mobile views of sites
  • Native support for the Opus audio codec

Firefox 14

Firefox 14 was released on July 17, 2012.

Firefox 14 is available for Windows, Mac OS X, Linux, and Android.

New features:

  • Privacy feature - Firefox now encrypts your Google searches using HTTPS
  • Bug fix - Full screen support for Mac OS X Lion
  • Security feature - You can now whitelist sites that you visit often and trust

Firefox 13

Firefox 13 was released on June 5, 2012.

Firefox 13 is available for Windows, Mac OS X, Linux, and Android.

New features:

  • The default home page now has quicker access to bookmarks, history, settings, etc.
  • When opening a new tab, users are now presented with their most visited pages
  • SPDY protocol now enabled by default for faster browsing on supported sites
  • 72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor
  • Implemented support for the following CSS properties: column-fill, CSS3 background-position
  • Support for the :invalid pseudo-class
  • The CSS3 <angle> type unit is now supported

Firefox 12

Firefox 12 was released on April 24, 2012.

Firefox 12 is available for Windows, Mac OS X, Linux, and Android.

New features:

  • Windows: Firefox is now easier to update with one less prompt (User Account Control)
  • Page Source now has line numbers
  • Line breaks are now supported in the title attribute
  • Support for the text-align-last CSS property

Firefox 11

Firefox 11 was released on March 13, 2012.

Firefox 11 is available for Windows, Mac OS X, Linux, and Android.

New features:

  • Style Editor - A new stylesheet editor. Visit any page, then select Style Editor from the Web Developer menu
  • "Tilt" 3D Page Structure View - The Inspector tool now offers a "3D" button
  • Support for the CSS text-size-adjust property (controls how mobile devices size text and show scrollbars when zooming into a web page)
  • Support for the outerHTML property
  • Firefox can now migrate your bookmarks, history, and cookies from Google Chrome
  • HTML5 tags are correctly highlighted when viewing the source
  • Files can be stored in IndexedDB.
  • The moz prefix has been removed from the Websockets API

Firefox 10

Firefox 10 was released on January 31, 2012.

Firefox 10 is available for Windows, Mac OS X, Linux, and Android.

New features:

  • Page Inspector/CSS Inspector - lets developers inspect the HTML and CSS
  • Scratchpad - A code editor that highlights syntax for JavaScript developers
  • New 3D graphics capabilities and anti-aliasing for WebGL content
  • Full-Screen API - enables developers to create full screen apps and games and deliver full screen video content
  • Support for CSS 3D Transforms

Firefox 9

Firefox 9 was released on December 20, 2011.

Firefox 9 is available for Windows, Mac OS X and Linux.

New features:

  • Added Type Inference; improving JavaScript performance (up to 30 faster than Firefox 8)
  • Improved theme integration for Mac OS X Lion
  • Added two finger swipe navigation for Mac OS X Lion
  • Added support for querying "Do Not Track" status via JavaScript
  • Added support for CSS3 font-stretch
  • Improved support for HTML5, MathML, and CSS

Firefox 8

Firefox 8 was released on November 8, 2011.

Firefox 8 is available for Windows, Mac OS X and Linux.

New features:

  • Twitter search engine installed by default
  • Third-party add-ons are disabled by default
  • A new "add-on selection dialog" allows to verify add-ons on upgrading
  • Tabs can be loaded "on demand" (making it much faster to restore windows with many tabs)
  • Support for Cross-Origin Resource Sharing (CORS), which lets developers load WebGL textures from other domains in a secure way
  • HTML5 context menu support
  • Firefox for Android: Mozilla has also added further functionality for the Firefox browser into Android devices

Firefox 7

Firefox 7 was released on September 27, 2011.

Firefox 7 is available for Windows, Mac OS X and Linux.

New features:

  • Improved memory handling
  • Bookmark and password changes now sync almost instantly when using Firefox Sync
  • The "http://" URL prefix is now hidden by default (just like Chrome)
  • Updated the WebSocket protocol from version 7 to version 8
  • Added a system for users to send performance data back to Mozilla

Firefox 6

Firefox 6 was released on August 16, 2011.

Firefox 6 is available for Windows, Mac OS X and Linux.

New features:

  • The address bar now highlights the domain of the website you're visiting
  • Streamlined the look of the site identity block
  • Added support for the latest draft version of WebSockets with a prefixed API
  • Added support for EventSource / server-sent events
  • Added support for window.matchMedia
  • Added Scratchpad, an interactive JavaScript prototyping environment
  • Added a new Web Developer menu item and moved development-related items into it
  • Improved usability of the Web Console
  • Improved the discoverability of Firefox Sync
  • Reduced browser startup time when using Panorama

Firefox 5

Firefox 5 was released in June, 2011.

Firefox 5 is available for Windows, Mac OS X and Linux.

New features:

  • Added support for CSS animations
  • Tuned HTTP idle connection logic for increased performance
  • Improved canvas, JavaScript, memory, and networking performance
  • Improved standards support for HTML5, XHR, MathML, SMIL, and canvas
  • Improved spell checking
  • Improved desktop environment integration for Linux users
  • WebGL content can no longer load cross-domain textures
  • Background tabs have setTimeout and setInterval clamped to 1000ms to improve performance

Firefox 4

Firefox 4 was released in March 2011.

Firefox 4 is available for Windows, Mac OS X and Linux.

New features:

  • Available in over 80 languages!
  • Fastest Firefox Ever - Firefox is up to six times faster than the previous release.
  • App Tabs - A permanent home to frequently visited sites like Web mail, Twitter, Pandora, Flickr.
  • Switch to Tab - Easily find and switch to any open tab from your Awesome Bar without opening duplicate tabs.
  • Panorama - Drag and drop tabs into manageable groups to save time while navigating many open tabs.
  • Firefox Sync - Access your Awesome Bar history, bookmarks, open tabs, passwords and form data across multiple computers and mobile devices.
  • New Add-ons Manager - More than 200,000 add-ons to customize the features, functionality and look of Firefox.
  • Do Not Track - Allows users to opt-out of tracking used for behavioral advertising.
  • Privacy first - Prevent others from accessing your browser history.
  • HTTP Strict Transport Security (HSTS) - Establishes secure connections to stop "man in the middle" attacks and keep sensitive data safe.
  • Content Security Policy (CSP) - Prevents cross-scripting attacks by allowing sites to explicitly tell the browser which content is legitimate.
  • JägerMonkey JIT compiler - along with enhancements to the existing TraceMonkey JIT and SpiderMonkey's interpreter for faster page-load speed and better performance.
  • HTML5 support - Includes hardware accelerated, high-definition video (WebM), 3D graphics, offline data storage, professional typography, touchscreen interfaces and the Mozilla Audio API.
  • Improves existing tools - like CSS, Canvas and SVG.
  • Uninterrupted browsing - when there is a crash in the Adobe Flash, Apple QuickTime or Microsoft Silverlight plugins.

Firefox 3.6

Firefox 3.6 was released in January 2010.

Firefox 3.6 is built on Mozilla's Gecko 1.9.2 web rendering platform, which has been under development since early 2009 and contains many improvements for web developers, add-on developers, and users. This version is also faster and more responsive than previous versions and has been optimized to run on small device operating systems such as Maemo.

New features:

  • Personas theme - allow users to change Firefox's appearance with a single click
  • Protection from out-of-date plugins - keep users safer as they browse
  • Open, native video can be displayed full screen and supports poster frames
  • Improved JavaScript performance
  • Ability for web developers to run asynchronously scripts - to speed up page load times
  • Support for downloadable web fonts - using the new WOFF font format
  • Improved support for CSS3, DOM, and HTML5

Older Firefox Versions

Firefox 3.5 - Released in June 2009.

Firefox 3.0 - Released in June 2008.

Firefox 2.0 - Released in December 2006.

Firefox 1.5 - Released in November 2005.

Firefox 1.0 - Released in November 2004.

Firefox Resources

Firefox's support website
Firefox's support website has a searchable knowledge database, articles, forums, and tutorials full of solutions and tips for a better experience.


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