New Version Don't Like

Older Version version official http://www.mozilla.com/en-US/firefox/all-older.html

Third-party Copies of older Versions http://www oldversion com use at your own risk.

Encourage users to downgrade is generally a bad idea, because critical updates of the security updates. Do not do this unless it is for troubleshooting, when everything has failed, and the user accepts that they can put themselves in danger by using an older version.
Edit: Please see this, this, this and this for a list of security issues resolved since 3.0.10.

Tags: Firefox

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