Old Version of Firefox 4.0 (Beta 12)
Selected Version
Firefox 4.0 (Beta 12)
Supported Systems
Legacy OS support
Windows 95, 98, Me (Firefox 2), 2000, XP, Vista, 7, 8
Open Source
Release Date
25 February, 2011 (10 years ago )

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Download Firefox 4.0 (Beta 12)
Firefox 4.0 (Beta 12)

Firefox 4.0 (Beta 12) (12.53 MB)

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System Requirements of Firefox 4.0 (Beta 12)
  • Windows 2000
  • Windows XP
  • Windows Vista
  • Windows Vista x64
  • Windows 7
  • Windows 7 x64
Program Information of Firefox 4.0 (Beta 12)
Version Name:
Firefox 4.0 (Beta 12)

File Size:
12.53 MB

Released Date:
25 February, 2011 (10 years ago)

MD5 Checksum:

SHA1 Checksum:

Version History of Firefox 4.0 (Beta 12)
  • Increased performance while viewing Flash content
  • Improved plugin compatibility with hardware acceleration enabled
  • Hovering over links now displays the URL at the bottom of the window rather than in the location bar
  • General…

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Firefox Screenshots
Firefox 4.0 (Beta 12) browser is created by Mozilla, a non-profit organization whose mission is to promote openness, innovation and opportunity on the… More
Start by searching or browse using Firefox 4.0 (Beta 12) version has lot of great new features. More
In this option Firefox no longer switches into offline mode automatically and improved plugin compatibility. More
About Firefox

Mozilla Firefox is a free, open source, cross-platform, graphical web browser developed by the Mozilla Corporation and hundreds of volunteers. The browser began as a fork of the Navigator component of the Mozilla Application Suite; Firefox has since become the foundation's main development focus (along with its Thunderbird mail and news client), and has replaced the Mozilla Suite as their official main software release.
Firefox includes tabbed browsing, a spell checker, incremental find, live bookmarking, a download manager, and an integrated search system that uses the user's desired search engine. Functions can be added through add-ons created by third-party developers, the most popular of which include the NoScript JavaScript disabling utility, Tab Mix Plus customizer, FoxyTunes media player control toolbar, Adblock Plus ad blocking utility, StumbleUpon (website discovery), Foxmarks Bookmark Synchronizer (bookmark synchronizer), DownThemAll! download enhancer, and Web Developer toolbar.

Firefox Features:

  • Remember site passwords without ever seeing a pop-up.
  • Bookmark, search and organize Web sites quickly and easily.
  • View Web pages faster, using less of your computer's memory.
  • Find the sites you love in seconds - enter a term for instant matches that make sense.
  • Avoid online scams, unsafe transactions and forgeries with simple site identity.
  • See any part of a Web page, up close and readable, in seconds.
  • Browse with a Firefox that's integrated into your computer's operating system.

Updates : Firefox Updates

Did You Know?

Firefox's previous names were Phoenix and Firebird.