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Install an older version of Firefox

Often when there is a problem with a Firefox update, people look for a way to go back to the previous version. That usually doesn't solve the problem and will make your computer and information vulnerable to attack. This article gives you some alternatives to downgrading and links to old versions of Firefox if you do choose to downgrade.

Installing a previous version doesn't fix most problems

Problems with an update are generally not caused by the new version of Firefox, but rather the update process. Installing a previous version will not help in most cases. 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 for each Firefox version update.

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 Such sofware may not be essential for your security, but if outdated, it may interfere with the use of Firefox, or cause Firefox to crash.

I still want to downgrade — where can I get the previous version?

Although Mozilla has a website with old versions of Firefox for testing purposes, it is not recommended that you use anything but the latest version.
Warning: Using old versions of Firefox poses a significant security risk.

  • Windows XP SP2 users: The last Firefox installer previous to Firefox 49 that can be executed on XP SP2 systems is Firefox 43.0.1 (US English).
Important: By default, Firefox is set to automatically update itself. If you install an older version of Firefox, you'll need to change your update settings to prevent the latest Firefox version from being reinstalled. See Advanced panel - Accessibility, browsing, network, updates, and other advanced settings in Firefox for details.

If you can't use the latest version of Firefox, instead of installing an older version and changing your update settings, we recommend that you use the latest version of another browser:

Help us make Firefox better

If the latest version of Firefox is causing problems for you or you just don't like something about it, please give us feedback about it here:

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Comments

See /forums/knowledge-base-articles/705214 for related discussions about this article.

For discussion about the Template:UpdateProblems used in this article, see /forums/knowledge-base-articles/706645

See my post No longer easy to download firefox 4

Apparently from the previous discussion this was expected. Presumably those wanting to download Fifrefox 4 will be left without advice, and this article will be archived.

For anyone who is wanting to downgrade to firefox 4 my personal suggestions

  1. read the KB article this discussion relates to
    • note for the near future firefox 3.6 is available as in the article
  2. consider is this necessary,
    • if so use the ftp server
    • but note firefox 5 is mainly an improved firefox 4 (there may well not be many instances where fx4 has any advantage over fx5)


Scoobidiver's edit: ftp link removed

From the release of Firefox 5, Firefox 4 is no longer maintained and considered as an unsafe browser. The previously maintained version is 3.6.

I reject this request.

I think it rather inappropriate to this being labeled rejected.

I agree maybe you do not wish to publicise ftp servers so openly.

I was under the impression this is just as it says a discussion area.

This surely is a valid discussion point the KB article is now providing almost misleading information. You may reject any idea of changes to the article but the comment that the advice fails if someone wishes to downgrade to firefox 4 is valid. And I think my comments may be of use to anyone who looks into the background of the article after failing to downgrade to fx4 - I have not recommended downgrading to fx4 myself, just the oposite - but inevitably something many users may want to try.

John99,

Here is a link to MozillaZine's article, in case it helps:

http://kb.mozillazine.org/Go_back_to_an_old_version_of_Firefox

Alice,

Thanks, I just think with fx5 launch, even if a small proportion of the whole, quite few users will be disappointed that one day they can use fx4 and the next they are not helped to downgrade to it again if they encounter problems with fx5. Such users will find your link useful.

You're welcome.

I asked in this post to hard-code Firefox 3.6, but without any feedback.

Based on /en-US/kb/Add-ons%20are%20disabled%20.../15222, I made the change. It needs review.

I made some edits based on the last pending revision, to reword the last section and to add a link to Troubleshoot and diagnose Firefox problems for other solutions. Needs review.

I approved the June 24, 2011 revision by scoobidiver. My June 26, 2011 edit to that revision is still pending.

Rejected.
The FTP section was removed, because it allows users to downgrade to un-maintained versions, and I think this falls into that category.

(For the record)

Revision id: 15271
Created: Jun 26, 2011 6:49:00 AM
Creator: AliceWyman
Reviewed: Yes
Ready for localization: No
Reviewed: Aug 2, 2011 8:03:49 PM
Reviewed by: Chris_Ilias
Is approved? Yes
Is current revision? Yes

I simplified the downgrade section so that it doesn't need to be updated constantly. It's not important when the policy of not maintaining modern versions of Fx started and what versions are no longer maintained. It's just important that the only one available is 3.6.

mverdi approved it.

I see some people who downgraded because something went wrong in the latest Firefox version use version 3.6.n with n different from 28.

We should display only limited versions like in http://releases.mozilla.org/pub/mozil.../releases/.

I see 3.6 still listed. Do we still recommend this?

From /forums/knowledge-base-articles/708440?#post-52273

Verdi said on May 13, 2013

<snip>
The amount of traffic from some older browsers has actually gone up as places like Facebook prompt people to update. Now we have support for these people (Firefox 3.6 users) not in showfor steps but in articles specifically targeted to them like: <snip>

There's also Firefox no longer works with Mac OS X 10.4 or PowerPC processors which includes a download link for Firefox 3.6.

Just my opinion but I think that as long as we still have articles like that we should keep the Firefox 3.6 download link.

There is Directory of other versions and languages link next to every version, although it's always same. We can add only one after all {for} sections.

I noticed that at the bottom of Norton's page on Compatibility of Norton Toolbar and Norton Identity Safe with Mozilla Firefox version 41 it recommends downgrading to Firefox 40, links to this article, and then explains how to turn off automatic updates. The following is copied from Norton's article:


After you downgrade to Firefox version 40, you need to turn off the automatic updates to stop Firefox from updating automatically.

Turn off automatic updates in Firefox

  1. In the Firefox window, on the top-right corner, click Open menu and then Options.
  2. In the Options window, on the left pane, select Advanced.
  3. In the Advanced window, on the Update tab, select Check for updates, but let me choose whether to install them.

I thought it made sense to tell users to turn off automatic updates in Firefox so I added a note about that to this article:

{note}Important: By default, Firefox is set to automatically update itself. If you install an older version of Firefox, you'll need to change your update settings to prevent the latest Firefox version from being reinstalled. See Advanced panel - Accessibility, browsing, network, updates, and other advanced settings in Firefox for details. {/note}

If you can't use the latest version of Firefox, instead of installing an older version and changing your update settings, we recommend that you use the latest version of another browser: <snip>

I also added a {for win10} link to Microsoft Edge

AliceWyman said

I thought it made sense to tell users to turn off automatic updates in Firefox so I added a note about that to this article: {note}Important: By default, Firefox is set to automatically update itself. If you install an older version of Firefox, you'll need to change your update settings to prevent the latest Firefox version from being reinstalled. See Advanced panel - Accessibility, browsing, network, updates, and other advanced settings in Firefox for details. {/note} If you can't use the latest version of Firefox, instead of installing an older version and changing your update settings, we recommend that you use the latest version of another browser: <snip> I also added a {for win10} link to Microsoft Edge


+1, done

ideato said

+1, done

Thanks :-)

I think we should create similar article also for firefox android to manage this kind of question:

See this thread Joni started:

https://support.mozilla.org/forums/knowledge-base-articles/710936 New articles needed

You could propose a new Install an older version of Firefox for Android article or just create it, as suggested in that thread. You can then ask for a review either in that thread or stat a new Discussion thread about it.

I made a new revision in which I removed most of "Directory of other versions and languages" links and left one at the end, outside of all Fors. I think that'll make the article easier to maintain, and it won't look so stupid when viewed in unsupported versions (no links to old versions!).

If you think that's not a good idea, defer it.

This is a really good idea, Marko.

I'll approve it but I won't mark it for L10N yet. I'll mark it when we do another significant edit to minimize hassles for the L10N community.

Thanks for revising this.

The Jun 12, 2016 revision is on the Not Ready for Localization list. It should have been a minor edit since the only change was to set an expiration date (2016-08-02). I'll resubmit the edit, approve it as a minor revision and then delete the Jun 12, 2016 revision.

For the record:

Revision id: 125374 Created: Jun 12, 2016, 6:57:53 PM Creator: Chris_Ilias Comment: set expire date Reviewed: Yes Reviewed: Jun 12, 2016, 6:58:13 PM Reviewed by: Chris_Ilias Is approved? Yes Is current revision? Yes Ready for localization: No

AliceWyman said

I'll resubmit the edit, approve it as a minor revision and then delete the Jun 12, 2016 revision.

Done.

Windows XP SP2 users can now download Firefox 49 and above.

From the Firefox 49 Release Notes / Issues / Discussions thread: https://support.mozilla.org/en-US/forums/contributors/712155?#post-70128

philipp said on September 8, 2016


From https://support.mozilla.org/kb/get-latest-version-firefox-windows-xp-vista/discuss/6770#post-14373

philipp said on September 8, 2016

hi, i just checked in the channel meeting with callek from release-engineering and starting with 49 we should be able to automatically produce sha1 signed builds with every release now that we will offer to xp and vista users on the download page. so we may be able to archive this article soon :-) https://bugzilla.mozilla.org/show_bug.cgi?id=1290179 https://bugzilla.mozilla.org/show_bug.cgi?id=1290737

philipp said on September 20, 2016

i now got a sha-1 signed installer for firefox 49 when i tried downloading the browser with xp :-)

I just saw that there's a /firefox/releases/49.0.2/win32-sha1/ directory. Is this needed Windows XP SP2? Here's the link:

https://download-installer.cdn.mozilla.net/pub/firefox/releases/49.0.2/win32-sha1/en-US/Firefox%20Se...

EDIT: I made a new revision as follows, to add the above link for WinXP SP2:

{for =fx50} {for win}

{for winxp}

{/for} {/for}