Old Version of Firefox 4.0 (RC 1)
Selected Version
Firefox 4.0 (RC 1)
Supported Systems
Legacy OS support
Windows 95, 98, Me (Firefox 2), 2000, XP, Vista, 7, 8
Open Source
Release Date
11 March, 2011 (10 years ago )

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Download Firefox 4.0 (RC 1)
Firefox 4.0 (RC 1)

Firefox 4.0 (RC 1) (12 MB)

okay 45 scans reported this version clean

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System Requirements of Firefox 4.0 (RC 1)
  • Windows 2000
  • Windows XP
  • Windows Vista
  • Windows Vista x64
  • Windows 7
  • Windows 7 x64
Program Information of Firefox 4.0 (RC 1)
Version Name:
Firefox 4.0 (RC 1)

File Size:
12 MB

Released Date:
11 March, 2011 (10 years ago)

MD5 Checksum:

SHA1 Checksum:

Version History of Firefox 4.0 (RC 1)
  • General stability, performance, and compatibility improvements
  • See the complete changelist from the previous beta
Firefox Screenshots
Installing the most powerful browser Firefox 4.0 (RC 1) stable and safe to use for daily web browsing, though the features and content may change before… More
Firefox 4.0 (RC 1) is available in 79 languages and the default homepage design has been refreshed. More
One of the option Firefox 4.0 (RC 1) lets you access your history, bookmarks, passwords and open tabs across all your devices using Firefox Sync. 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?

Did you know, Firefox has a hidden "page" dedicated to robots! To view this: 1. Open your Mozilla Firefox 2. In the address bar, type the following: about:robots