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 Updating Firefox.
Problems after upgrading Firefox are generally not caused by the new version itself, but rather the upgrade process.
Installing a previous version will not help for most problems. Some common issues include:
* Can't access websites anymore
* "Firefox can't connect securely..." error
Other problems can be solved by creating a new profile.
If you find none of these things work and you still want to downgrade to a previous version, you can do so by downloading and running a previous version's installer.
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