Go back to an old version of Firefox

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This article describes how to go back to a old version of Firefox, including how to downgrade to an obsolete version where you can't just reuse your existing profile. See this article if you want to go back to an old version of Thunderbird.

Older version

Normally you can use the existing profile with an older version as long as it has the same major version number. For example, you could switch from Firefox 3.6 back to 3.0. If some of the data is unusable or ignored see if Transferring data to a new Firefox profile discusses how to convert or export that data.

  1. Download the version you want from here or here.
  2. Uninstalling doesn't delete your profile but you should back it up first as a precaution using something like MozBackup.
  3. Exit Firefox and then uninstall it. Make sure to remove the Firefox installation directory.
  4. Install the older Firefox version. You can install Firefox in the same location to minimize any side effects. For example, the Windows registry or other installed programs may expect Firefox to be in the default location (e.g., C:\Program Files\Mozilla Firefox on Windows).
  5. After installing the older version, turn off the automatic Firefox Software Update feature (if enabled).
  6. Reconfigure your firewall if you have one.
  7. If Firefox disables any of your add-ons you probably need to replace it with a version that supports a older version of Firefox.

Obsolete version

There are real security problems (actual exploits in the real world) with Firefox 2. Rather than going back to Firefox 2 you should consider switching to 模板:SeaMonkey, Google Chrome or Opera. Its not a question of whether Firefox 3 is inherently more secure than Firefox 2 - its that Firefox 2 has reached end of life and you can't get any more updates, and the malware and phishing detection uses a obsolete version of the SafeBrowsing anti-phishing feature.

If you look at the Security Advisories for Firefox 3.0 Firefox 2.0.0.20 appears to have the same security fixes as Firefox 3.0.4. There's a slight risk in not using the latest released version of Firefox, but the risk of using Firefox 2 is just going to increase with time. Things can only get worse. If you want to go back to Firefox 2 anyways its recommended that you use the last version of Firefox 2 (2.0.0.20) and:

  • Consider installing the Netcraft toolbar add-on to block phishing web sites.
  • Make certain you keep the plugins up to date, there are increasing numbers of Flash and PDF exploits. If you can't, either disable the plugin or find an alternative such as using the Foxit reader to view the PDF file in a separate window rather than using the Adobe plugin to view it in the browser window.
  • Install either the the NoScript add-on (recommended) or the YesScript add-on

Firefox 3 uses different files for some of the data. It doesn't support exporting

so you can't move all of your data from Firefox 3 to Firefox 2, though there are a few workarounds.

  1. Mozilla periodically deletes older versions from their download web site. If you can't download the version you want from here, you can download older Firefox releases, including Firefox 2.0.0.20, from here.
  2. Back up your profile using something like MozBackup.
  3. Export bookmarks to an .HTML file.
  4. Install the Password Exporter add-on and export your passwords as a .CSV file.
  5. See this blog entry for how to convert your cookies to a cookies.txt file. However, its probably not worth the hassle.
  6. Exit Firefox.
  7. Open Windows Explorer and find your Firefox profile. You might need to configure Windows Explorer to show hidden files and folders.
  8. Delete all the sqlite files in the profile except search.sqlite, and delete signons3.txt and urlclassifierkey3.txt. This will prevent problems if you ever use Firefox 3 again with that profile.
  9. Delete the localstore.rdf, xpti.dat, compreg.dat, extensions.ini, extensions.cache, and extensions.rdf files in the profile.
  10. Uninstall Firefox. Make sure to remove the Firefox installation directory.
  11. Install the obsolete Firefox version. Install Firefox in the same location to minimize potential side effects.
  12. After installing the obsolete version, turn off the automatic Firefox Software Update feature (if enabled).
  13. Reconfigure your firewall if you have one.
  14. Import the bookmarks HTML file and your passwords.
  15. If Firefox disables any of your add-ons you probably need to replace it with a version that supports a older version of Firefox.

See also

External links