Install an older version of Firefox

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The template "Only in Fx4" does not exist or has no approved revision. This article describes how to install a previous version of Firefox, a process also known as "downgrading". For instructions on how to install a newer version, see Update Firefox to the latest release.

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:

Other problems can be solved by creating a new profile or by following the steps in the Troubleshoot and diagnose Firefox problems article.

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

Starting with the release of Firefox 5, the previous version of Firefox (Firefox 4 in this case) (Firefox 5 in this case) will no longer be maintained with security and stability updates. Firefox 3.6 is the last previous Firefox version that is still being maintained. To downgrade to Firefox 3.6, download and run its installer from this page.

Warning: Firefox 3.6 will only be maintained with security and stability updates for a short period of time.