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Downgrading usually doesn't solve Firefox problems. This article gives you links to old versions of Firefox and some alternatives to downgrading.

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: [[Template:UpdateProblems]] {for not fx35} {note}'''Note:''' Other problems can be solved with the [[Refresh Firefox - reset add-ons and settings|Reset Firefox feature]]. It restores Firefox to its default state while saving your essential information.{/note} {/for} {for fx35} {note}'''Note:''' Other problems can be solved with the [[Refresh Firefox - reset add-ons and settings|Refresh Firefox feature]]. It restores Firefox to its default state while saving your essential information.{/note} {/for} = I still want to downgrade — where can I get the previous version? = Although Mozilla has a [https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ website] with old versions of Firefox for testing purposes, it is not recommended that you use anything but the latest version. {warning}'''Warning:''' Using old versions of Firefox poses a significant security risk.{/warning} {for =fx38} {for win} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/37.0.2/win32/en-US/Firefox%20Setup%2037.0.2.exe Firefox 37.0.2] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for mac} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/37.0.2/mac/en-US/Firefox%2037.0.2.dmg Firefox 37.0.2] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for linux} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/37.0.2/linux-i686/en-US/firefox-37.0.2.tar.bz2 Firefox 37.0.2] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {/for} {for =fx39} {for win} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/38.0.5/win32/en-US/Firefox%20Setup%2038.0.5.exe Firefox 38.0.5] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for mac} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/38.0.5/mac/en-US/Firefox%2038.0.5.dmg Firefox 38.0.5] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for linux} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/38.0.5/linux-i686/en-US/firefox-38.0.5.tar.bz2 Firefox 38.0.5] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {/for} {for =fx40} {for win} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/39.0.3/win32/en-US/Firefox%20Setup%2039.0.3.exe Firefox 39.0.3] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for mac} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/39.0.3/mac/en-US/Firefox%2039.0.3.dmg Firefox 39.0.3] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for linux} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/39.0.3/linux-i686/en-US/firefox-39.0.3.tar.bz2 Firefox 39.0.3] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {/for} {for =fx41} {for win} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/40.0.3/win32/en-US/Firefox%20Setup%2040.0.3.exe Firefox 40.0.3] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for mac} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/40.0.3/mac/en-US/Firefox%2040.0.3.dmg Firefox 40.0.3] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for linux} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/40.0.3/linux-i686/en-US/firefox-40.0.3.tar.bz2 Firefox 40.0.3] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {/for} {for =fx42} {for win} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/41.0.2/win32/en-US/Firefox%20Setup%2041.0.2.exe Firefox 41.0.2] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for mac} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/41.0.2/mac/en-US/Firefox%2041.0.2.dmg Firefox 41.0.2] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {for linux} *[https://download-installer.cdn.mozilla.net/pub/firefox/releases/41.0.2/linux-i686/en-US/firefox-41.0.2.tar.bz2 Firefox 41.0.2] (US English) *[https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Directory of other versions and languages] {/for} {/for} {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#w_update-tab]] 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: {for win} {for win10} *[https://www.microsoft.com/en-us/download/details.aspx?id=48126 Microsoft Edge] {/for} {for not win10} *[http://windows.microsoft.com/en-us/internet-explorer/download-ie Internet Explorer] {/for} *[https://www.google.com/chrome Google Chrome] *[http://www.opera.com/ Opera] {/for} {for mac} *[http://www.apple.com/safari/ Safari] *[https://www.google.com/chrome Google Chrome] *[http://www.opera.com/ Opera] {/for} {for linux} *[https://www.google.com/chrome Google Chrome] *[http://www.opera.com/ Opera] {/for} =Help us make Firefox better= If the [http://www.mozilla.org/firefox/all.html 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: *{button [http://input.mozilla.org/feedback/ Submit your feedback and suggestions about Firefox]}