Firefox 4.0

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Warning: Firefox now includes downgrade protection to prevent corruption of user profile data. If you install an older version, you'll be prompted to create a new Firefox profile.

If there is a problem with a new version of Firefox, some people may want to downgrade Firefox to a previous version but we do not recommend this. The latest Firefox version includes security updates so downgrading to an older version leaves you more vulnerable to attacks and usually doesn't fix the problem. This article gives you some alternatives to downgrading and links to older versions of Firefox if you do choose to downgrade.

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Firefox 4 Release Notes. V.4.0.1, released April 28th, 2011 Check out what’s new, the known issues and frequently asked questions about the latest version of Firefox. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. Mozilla Firefox 4 is a version of the Firefox web browser, released on March 22, 2011. The first beta was made available on July 6, 2010; Release Candidate 2 (a base for the final version) was released on March 18, 2011. It was codenamed Tumucumaque, and was Firefox's last large release cycle. Philips laptops & desktops driver download for windows 10.

  1. Mozilla Firefox Description. Mozilla Firefox is a free, fast and efficient cross-platform web browser and one of the most popular browsers in use. Firefox boasts speed and tabbed.
  2. Mozilla Firefox 4.0.1: Schneller und sicherer Download, Sofort, Kostenlos und Werbefrei bei soft-ware.net. Dein Download Portal.
  3. All your favorite Google tools (like Gmail and Docs) work seamlessly in the Firefox Browser. Download this browser extension to stop Facebook (and Instagram) from tracking you around the web. Firefox is available on all your devices; take your tabs, history and bookmarks with you. All you need is a Firefox.

Problems with an update are usually not caused by the new version of Firefox, but rather the update process. In most cases, installing a previous version will not help. Instead, see:

Note: Other problems can be solved with the Refresh Firefox feature. It restores Firefox to its default state while saving your essential information.

Ensure all security and security-related software is fully updated. Some security software will need to be upgraded to a new version so that it is compatible with each Firefox version update.

Optional software bundled with security software also may need updating. Such software may not be essential for your security but, if outdated, may interfere with the use of Firefox or cause Firefox to crash.

If you still want to downgrade, you can visit Mozilla's directory of older Firefox versions using the links below. Please note, however, that using older versions can make Firefox insecure and more vulnerable to attacks and scams. We recommend that you always use the newest version of Firefox.
Warning: Old Firefox versions pose a significant security risk.
  • Firefox 77.0.132-bit (US English)
  • Firefox 77.0.164-bit (US English)
  • Firefox 77.0.132-bit (US English)
  • Firefox 77.0.164-bit (US English)
  • Firefox 78.0.232-bit (US English)
  • Firefox 78.0.264-bit (US English)
  • Firefox 78.0.232-bit (US English)
  • Firefox 78.0.264-bit (US English)
  • Firefox 79.032-bit (US English)
  • Firefox 79.064-bit (US English)
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  • Firefox 79.064-bit (US English)
  • Firefox 80.0.132-bit (US English)
  • Firefox 80.0.164-bit (US English)
  • Firefox 80.0.132-bit (US English)
  • Firefox 80.0.164-bit (US English)
  • Firefox 81.0.232-bit (US English)
  • Firefox 81.0.264-bit (US English)
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  • Firefox 82.0.332-bit (US English)
  • Firefox 82.0.364-bit (US English)
  • Firefox 82.0.332-bit (US English)
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  • Firefox 83.032-bit (US English)
  • Firefox 83.064-bit (US English)
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  • Firefox 84.0.232-bit (US English)
  • Firefox 84.0.264-bit (US English)
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  • Firefox 85.0.264-bit (US English)
Firefox
  • Firefox 85.0.232-bit (US English)
  • Firefox 85.0.264-bit (US English)
  • Firefox 86.0.132-bit (US English)
  • Firefox 86.0.164-bit (US English)
  • Firefox 86.0.132-bit (US English)
  • Firefox 86.0.164-bit (US English)
  • Firefox 87.032-bit (US English)
  • Firefox 87.064-bit (US English)
  • Firefox 87.032-bit (US English)
  • Firefox 87.064-bit (US English)
Important: By default, Firefox is set for automatic updates. To prevent Firefox from automatically updating itself after you install an older version, you'll need to change your Firefox update settings: In the Menu bar at the top of the screen, click Firefox and select Preferences.Click the menu button and select ... In the General panel, go to the Firefox Updates section.

Instead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives:

Install Firefox Extended Support Release.Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations such as universities and businesses. Firefox ESR does not come with the latest features, but it does have the latest security and stability fixes. For more information, see the article Switch to Firefox Extended Support Release (ESR) for personal use.

Use the latest version of another browser. If you are not satisfied with the current Firefox version or it simply is not working right now, there are alternative browsers that you can use to browse the web.

< Releases
  • 1Firefox 4 Desktop Launch Schedule
    • 1.6Tuesday, March 22
  • Bookmark this page for the latest updates on timing
Firefox

Thursday, March 17

  • 11:30 am PDT - Triage to make sure there are no late-breaking issues
  • Rebuild for RC2
  • Watch crash-stats and input.mozilla.com
  • QA web content (mozilla.com) on stage
  • QA test RC2 Build 2

Friday, March 18

  • Rebuild for RC2 build 3
  • Continue to QA test RC2 build 2 (testing can be carried over)
  • 11:30 am PDT - Triage to make sure there are no late-breaking issues
  • spot-check RC2 build 3
  • Watch crash-stats and input.mozilla.com
  • QA Sign-off
  • push RC2 build 3 to mirrors
  • push RC2 build 3 to beta channel users
  • Notify IT of intent to seed mirrors

Saturday, March 19

  • Watch crash-stats and input.mozilla.com

Sunday, March 20

  • wait for release-drivers 'go for seeding launch' from beltzner
  • Evening PDT - Push final release directory to mirrors
  • +2 hours - Updates on releasetest for QA to test

Monday, March 21

  • 11:30 am PDT - Triage to make sure there are no late-breaking issues
  • 12:00PM PDT - Final call on 'Go launch' (Beltzner)
  • 4:00 pm PDT - Push microsite pages live and test
  • All day Watch crash-stats and input.mozilla.com

Tuesday, March 22

War Room Mountain View

  • MoCo employees working on the launch will be in 10Forward* - Everyone Welcome! Let us know if you will be in the MTV office for the early-morning launch activities so we can plan accordingly
  • People will start showing up at 5:30 am PDT
  • IRC backchannel will be #firefox4 on irc.mozilla.org
  • The war room will be streamed live on Air Mozilla. Suggest speakers here.
  • There will be food, activities and a whole lot of awesomeness starting at 6:00AM:
    • 6:00am Breakfast in Ten Forward
    • 6:00am Air Mozilla broadcast starts
    • 12:00pm Firefox 4 Launch Lunch in R2D2/CP3O
    • 4:00pm Launch Cantina, don't forget to invite your Friends and Family
    • Throughout the day we'll have celebrations for download milestones and coverage. Examples: Banner unveiling on Castro Street, cake cutting, champagne, and more surprises..
  • *Note: Each office will be organizing their own War Room and activities and we will all be linked together on video

Launch Day Timeline

  • 6:00 am PDT - Push mozilla.com pages and update product details to point the download links ~20 min
  • Flush the web caches~10 min
  • Check the live pages ~20 min
  • Push manual / 'Check For Updates' update on release channel for 3.6 users ~10 min
  • Push manual / 'Check For Updates' update on release channel for 3.5 users ~10 min
  • Official Launch - Make announcement
  • Push campaigns, promos, wall posts, newsletter, blogs, tweets, community note, etc.
  • QA validate manual updates ~2 hours
WE ARE HERE

Firefox 4.0 Android

Wednesday, March 23

  • Get ready for the Firefox 4 for Mobile launch!
  • Continue to provide support on SUMO
  • Watch crash-stats and input.mozilla.com

Firefox 4.0 Filehippo

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