Firefox
Old Version of Firefox 4.0 (RC 2)
Selected Version
Firefox 4.0 (RC 2)
Supported Systems
Legacy OS support
Windows 95, 98, Me (Firefox 2), 2000, XP, Vista, 7, 8
License
Open Source
Release Date
18 March, 2011 (4 years ago )

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Download Firefox 4.0 (RC 2)
Firefox 4.0 (RC 2)

Firefox 4.0 (RC 2) (12 MB)

okay 46 scans reported this version clean

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System Requirements of Firefox 4.0 (RC 2)
  • Windows 2000
  • Windows XP
  • Windows Vista
  • Windows Vista x64
  • Windows 7
  • Windows 7 x64
Program Information of Firefox 4.0 (RC 2)
Version Name:
Firefox 4.0 (RC 2)

File Size:
12 MB

Released Date:
18 March, 2011 (4 years ago)

MD5 Checksum:
417e9bc84cd14b0d7d9c05dd5e869bbe

SHA1 Checksum:
E76F9AE709F6E4FE1D046CF74EA69BC8380E7C55

Version History of Firefox 4.0 (RC 2)
  • Blacklisted a few invalid HTTPS certificates
  • Updated localizations for 29 locales
  • Added Vietnamese localization, bringing the total languages available in Firefox¬†4 to 83
Firefox Screenshots
Installing Firefox 4.0 (RC 2) bringing together all kinds of awesomeness to make browsing better for you. More
Firefox 4.0 (RC 2) is created my Mozilla, is considered stable and safe to use for daily web browsing, features and content. More
Mozilla help your favorite add-ons get updated. By using this extension recommended for alpha and beta users only. 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 vulnerabilities are fixed on average one day after the exploit code is made available, as compared to nine days for Internet Explorer.