Firefox Browser

# Mozilla Firefox Browser

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## The Firefox Browser

Firefox is a free, open-source web browser from Mozilla.

Firefox is one of the most popular internet browsers today.

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

Download Firefox

## Firefox Statistics

The following figures are extracted from our Browser Statistics:

2014 | Total | FF 34 | FF 33 | FF 32 | FF 31 | FF 30 | FF 29 | FF 28 | FF 27 | FF 26 | FF 25 | 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 | FF 26 | FF 25 | FF 24 | FF 23 | FF 22 | FF 21 | FF 20 | FF 19 | FF 18 | FF 17 | 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 | FF 17 | FF 16 | FF 15 | FF 14 | FF 13 | FF 12 | FF 11 | FF 9-10 | FF 4-8 | FF 3.6 | 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 | FF 4 | FF 3.6 | FF 3.5 | FF 3.0 | 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 |  |  |  |  |  |  | FF 4 | FF 3.6 | FF 3.5 | FF 3.0 | 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 |  |  |  |  |  |  |  | FF 3.5 | FF 3.0 | FF 2.0 | 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 |  |  |  |  |  |  |  | FF 3.0 | FF 2.0 | FF 1.5 | 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%

These statistics are based on W3Schools' users.

## 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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